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Over the last 3 nights i have lost 4 fish, 2 topedo barbs,1 hatchet and 1 corydoras,the hatchet had 1 eye missing the corydoras had signs of bruising on its side.
The tank also contain 10 tiger barbs, 4 large yoyos 3 cherry barbs 2 bristlenose 4 corydoras,the torpedo barbs were the latest introductions, could it be that the larger topedo barb is the killer.The tank is 120cm 200+ lts,9 months old and water quality is ok.Have had no trouble with un explained deaths in the past.
thanks.

Hi Terrier I have looked on google for you and it looks like the only to things you have in your tank that would hurrt the other's are the (tiger barbs) and your(corydoras) Thay are the only to I have read that is noing to eat the other fish. The big topedo babr is not doing it. I have read on the web they are the most peacefull thing you could own. Just check out google

edith

Hi there,
Denisoni (torpedo) barbs are not aggressive at all.
It is highly unlikely that they killed any of your fish.

What is much more likely is that the fish brought in
with them some kind of illness or disease that has transferred to your other fish rapidly.
This is why its always a good idea to quarantine new fish for 2 weeks before putting them in with your other healthy fish.
As 1 torpedo barb is dead, its obvious that that is the one that brought the illness.

The eye missing on the hatchet suggests either an injury, or had been picked off after death, probably by the yoyo loaches.

Can you post any noticeable symptoms,
tank size in gallons (there is a calculator under the
"interactive" tab for you to check if need be),
and post results for
ammonia
nitrItes
nitrAtes
and ph.


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Thanks for your input ,the large topedo barb was not to blame as it also is now dead, along with another corydoras,the topedo barb had slight discolouring around the dorsal fin,the corydoras appears to have cloudy eyes.
The thing is,what ever the problem is the fish seem to be dying very quickly.

The tank size is approx 216 lts (PLANTED)
nitrite = 0mg/L
nitrate = 20mg/L
ammonia = 0mg/L
PH = 7.5

For sudden deaths there has to either an introduced problem fish, plants, and water during change. Also it can happen as the result of a filter change not being done collectly, contaminated water from lack of correct maintainance.

Now for some questions.
Filtration type, how cleaned also how often?
Substrate cleaning how is this done and again how often?
Water changes what percentages, is it treated first, and how often.
Where do you get the water from town supply or another source?
Have you fed any live food recently?

Your location might help in case others in the same area could have had simmilar problems.

Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info

Look here for my
Betta 11Gal Desktop & Placidity 5ft Community Tank Photos

Keith

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Keithgh hi, thanks for your reply, Filtration by fluval 305 external + fluval 4plus internal. Water change 20% weekly,substrate cleaned weekly with gravel cleaner. Tap water treated and preheated using boiled water before adding to tank.
Last fish to be added were 3 otocinclus which are doing fine.
Checked water quality last night every thing was ok,
tested for chelated iron found it to be above 0.5mg/L carried out water change to get level below 0.5mg/L. Do you think that this could be the possible cause of deaths.
Found 1 tiger barb dead this morning.

As far as the Chelated Iron to be honest I would have no idea at all. All I know about CI is that I use it in the garden to green up several species of shrub plants.
I also heat up my water BUT I sit the water container into a laundry trough of hot water. As far as I know boiled water should not be used in a tank at all.

I would do 30% water change weekly to star of with and add a Bio starter ever time. When you say treated what are you using and how much?
When and how often do you clean the filter material. To give you an idea I clean the 5ft tank Eheimm Pro11 monthly and the small internal Betta tank Eheim weekly.

Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info

Look here for my
Betta 11Gal Desktop & Placidity 5ft Community Tank Photos

Keith

Near enough is not good enough, therefore good enough is not near enough, and only your best will do.
I VOTE DO YOU if not WHY NOT?
VOTE NOW VOTE NOW

hi keith
to be honest tank is over 10 months old and i have been using the same methods all this time and have had no promlems.
The external filter is cleaned at least once a month depending on flow rate.
The internal filter is cleaned weekly.
The treatment i use is Nutrafin Aqua Plus and is used as per instructions.
Do not know if there are any deaths this morning as the lighting has not switch on yet,and i am now off to work, thanks will let you know
shane.

Are you adding a Bio starter at every water change? The reason for doing this it keeps the origional good bacteria healthy and in its origional state.

The only other thing I can think of is that you imported a problem with your water. I have done this and so have several otheres and the actual cause is extremly hard to find.

Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info

Look here for my
Betta 11Gal Desktop & Placidity 5ft Community Tank Photos

Keith

Near enough is not good enough, therefore good enough is not near enough, and only your best will do.
I VOTE DO YOU if not WHY NOT?
VOTE NOW VOTE NOW

Kieth
Hi there, no more fish deaths to date, it must have been down to the excessive chelated iron, lets hope so any way.
Thanks for all your advice.
shane.