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Update: N and P are invisible:

It's important to know/remember that Inorganic Nitrate and Inorganic Phosphate, which is what your test kits read, and which are also what causes the nuisance algae to grow in your tank, are invisible. You can see the results of the nitrate and phosphate; it's the nuisance algae. But you cannot see the nitrate and phosphate itself. This fact causes the most problems when people see a lot of stuff (food) that their skimmers have removed, but wonder why their nuisance algae is not being removed (skimmers don't remove Inorganic Nitrate and Inorganic Phosphate), and also when their phosphate tests zero, but they still have algae on certain parts of the rocks (the invisible phosphate is coming out of the rocks.)

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Update: FW cleanings

Pods eating the algae: The reason you need to run freshwater over your screen every week is because you want to kill the baby pods that start to grow and eat the algae. You may not see the eaten areas, unless the algae is very thin like this:



However, pods are always growing and multiplying. And they eat algae. The reason this is a problem is that (1) pods are constantly flowing out of your scrubber into the tank. If they eat algae first, then the nitrate and phosphate that is in that algae gets released back into the water, and (2) you now have less algae to do the filtering. Unlike the picture above, however, the algae is usually too thick for the eaten areas to be seen. The pods stay out of the light, in the underlying layers; so you don't see what they are eating. By cleaning your screen in freshwater, you kill the pods that are on your screen. They will start multiplying again within a few minutes, but at least you can keep them under 7 days old. And even if you clean only half of the screen each week, you still want to wash the whole screen in FW.

My Tank Pics: www.radio-media.com/fish/Tank.htm
Scrubber FAQ: www.algaescrubber.net/forums/viewtopic.php?f=9&t=68
Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Successes Update:

sean48183 on the SWF site: "Alright, just tested NO3 and ta da! 0 NO3! Awesome. Still have some hair algae in display, but appears to have slowed down. My scrubber is still getting mostly brown slime and some green. Don't really care. It is working. Have to clean every couple days because it is growing so fast. Anyone who is debating trying -- quit debating and just do it."

ScubaDrew on the RS site: "I built a small one using the basic plans posted in the first few pages. I used a dremmel to cut the slot in the PVC and used fishing line through the small holes in the plastic divider material to hold it up. My tank measured 0’s in all the algae related categories prior to building it, but my tank was still growing a lot of HA and some cyano. I’ve only got one florescent ‘flood’ style light on one side of the scrubber right now due to having placed it in an already crowded sump. I had a full coat of algae in about 10 days, and cleaned off about ¾ of what had accumulated at that time. Now I need to clean off a large, heavy, handful every week! With continued cleaning in my DT, I’ve really made progress in getting the DT algae free. Thanks for the info, I think the ATS will be a part of my system for a long time to come."

RiaanP on MASA site: "Scrubber running now for four weeks. NO3 0mg/l (first time EVER). PO4 between .025 and 0.5 mg/l. 4 weeks ago NO3 was over 100 mg/l and PO4 was over 2 mg/l. So a scrubber really works."

My Tank Pics: www.radio-media.com/fish/Tank.htm
Scrubber FAQ: www.algaescrubber.net/forums/viewtopic.php?f=9&t=68
Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Part 2 of 7:

Taken from "From the Food of Reefs to the Food of Corals" by Eric Borneman
http://www.reefkeeping.com/issues/2002-08/eb/index.php

"Nitrogen levels in [natural] coral reef waters are typically extraordinarily low, with most being found as ammonia. This is in contrast to aquaria, where the dominant nitrogen species is usually nitrate. Nitrogen is the be-all end-all for zooxanthellae growth and reproduction [zooxanthellae is what photosynthesizes light into food for corals]. By limiting nitrogen in the form of excretion products, the [coral] polyps keep the zooxanthellae in the numbers and density that maximize photosynthetic efficiency for its own use. Using several released compounds, most of which are still unidentified, the [coral] polyp stimulates the zooxanthellae to release virtually all of the products of its photosynthesis, and these are then used by the polyp for its own needs. If nitrogen was made readily available to the zooxanthellae (for example, if high levels were present in the water and this dissolved nitrogen diffused into the coral tissue), it could then be accessed by the algae without limitation by the polyp, and zooxanthellae could begin to grow and reproduce like a phytoplankton culture. In this case, the symbiosis becomes less advantageous to the coral, and it will expel some of the symbionts to try and re-establish maximal benefit from its algal partners. As a practical note, when very high densities of zooxanthellae exist in coral tissue [because of to much nitrogen], the resultant coloration of the coral is usually a rich or dark brown color.

"Coral mucus, in turn, and as was shown in the previous article, is itself a food source to the reef.

[Skimmer remove mucus, but do not remove nitrogen]


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Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Question:

Anyone know where to buy marine self-priming pumps? Several people are trying to build the top-of-nano scrubber I posted, but in order to put the pump in the scrubber (and thus not in the display), the pump needs to be able to pull water up and out of the display. So far, the only thing found is the Eclipse nano hoods with small pumps built in, and a few other HOB filters with small self-priming pumps built in. But these are built-in and molded to the other parts. What is really needed is a self-contained pump that is separate from the other parts, and which of course is aquarium safe, and in the 70 to 150 gph range (266 to 570 lph).

My Tank Pics: www.radio-media.com/fish/Tank.htm
Scrubber FAQ: www.algaescrubber.net/forums/viewtopic.php?f=9&t=68
Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Update: Nutrients vs. Nutrition

It's important to understand the difference between these two words. "Nutrients" generally means Inorganic Nitrate and Inorganic Phosphate, which are the things that you measure with your test kits, and which are also the things that nuisance algae feed on. "Nutrition", however, generally means food for corals and fish. Natural reefs in the ocean are high in "nutrition" (lots of food particles floating around), but low in "nutrients" (nitrate and phosphate). Aquariums that have skimmers, or other mechanical filters like foam or floss, are low in nutrition because the food is filtered out, but they are high in nutrients because the Inorganic Nitrate and Inorganic Phosphate is not filtered. Aquariums that have only scrubbers are high in nutrition but low in nutrients. Aquariums with both skimmers and scrubbers are low in both nutrition and nutrients.

My Tank Pics: www.radio-media.com/fish/Tank.htm
Scrubber FAQ: www.algaescrubber.net/forums/viewtopic.php?f=9&t=68
Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Part 7 of 7:

"The Food of Reefs, Part 7: Dissolved Nutrients" by Eric Borneman
http://reefkeeping.com/issues/2003-04/eb/index.php

"Mucus consists of mainly sugars and glycoproteins - soluble materials in and of themselves. However, the formation of mucus, and its release in a matrix of chains of these materials, may result in a particulate material. This material is both utilized directly by many organisms, and also forms the basis for a predominant fraction of the particulate "marine snow" on reefs.

"In fact, reef waters are 30-40% higher in DOM [disolved organic matter] than oceanic waters.

"In terms of determining the degree to which organisms may use dissolved material as significant source of nutrition, one may examine the surface area of the outer cell membranes exposed to such materials. In general, the larger the absorptive area, the more likely organisms are to depend on absorption. Some cell surfaces are covered with many finger-like processes called microvilli that greatly increase the surface area of the membrane. Furthermore, the presence of cilia is often a good indicator of absorptive surfaces. Perhaps not surprisingly, corals have extensive microvilli and cilia.

"Corals are able to take up various forms of both organic and inorganic dissolved nitrogen.

"Even slightly elevated nitrogen levels can quickly result in rapid increases in the density of zooxanthellae, as they use it to fuel their own reproduction" [and thus turn the coral brown]

"It is also somewhat equivocal that corals are able to utilize nitrate (which exists nearly totally in its ionic state at physiological pH) at all, and an inability to find nitrate reductase in many studies, makes the ultimate importance of this dissolved nitrogen source to corals (and anemones) rather tenuous. However, it is unambiguously true that ammonium is a sought-after nitrogen source by both coral host and algal partner.

"Humic (refractory) compounds: These yellowing compounds are typically found at relatively high levels in aquaria, and they are removed with protein skimming and activated carbon. Humic materials have been thought to be relatively inert and unavailable for use as a nutrient source. However, studies have shown that organisms from bacteria to brine shrimp (Artemia salina) can utilize humic substances as a source of nutrients.

"In terms of corals reefs, the amounts of most dissolved nutrients, except carbon in most cases, are very low.

"The higher nutrient levels may cause corals and other symbiotic partnerships to decline as the partner algae preferentially utilize the increased nutrient sources to the expense of the host. [and thus browning of the coral occurs]

"Without question, corals and many reef organisms are able to utilize dissolved nutrients to help meet their energy requirements and to use in tissue growth.



My Tank Pics: www.radio-media.com/fish/Tank.htm
Scrubber FAQ: www.algaescrubber.net/forums/viewtopic.php?f=9&t=68
Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Anyone still reading this thread and want me to keep posting? I'm doing some cleanup...

My Tank Pics: www.radio-media.com/fish/Tank.htm
Scrubber FAQ: www.algaescrubber.net/forums/viewtopic.php?f=9&t=68
Automatic Continuous Feeder: www.algaescrubber.net/forums/viewtopic.php?f=2&t=110

Hi,
Actually, I have read every single one of your postings
and looked at every picture.
But... I've a freshwater tank!

The information that you have posted here over the years
is invaluable to someone in the marine environment, and
should I switch over to the "dark side" I would follow
your advice and examples.
Your posts seemed to be a log of your experiences, and not
necessarily one urging replies or comments. I've always
figured that you were corresponding with your readers on
the side, and thus never posted here, until now.

I'd vote for you to continue with your postings.

Frank


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