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Some leaves of my Echinodorus Tenellus and Hygro Polysperma Rosa turned yellowish. I've also got a Valisneria Spiralis which is doing perfectly fine. Tank parameters as follows: NO3 = 0, NO2 = 0, GH > 10, PH = 7.2 though can't be too sure as consecutive readings show varying results.
Anyhow, I've also got three lyretail mollies in the tank.
What do I need to do to avoid leaves turning yellow and ensure healthy plant growth?

Hi,
I don't see what size that tank is but from the yellowing
leaves, your fish are not providing the necessary nutrients
and you will have to start adding some fertilizers.

Here is a site that you might want to keep and refer to
from time to time:

http://www.csd.net/~cgadd/aqua/art_plant_nutrient.htm

Frank


-->>> The Confidence of Amateurs, is the Envy of Professionals <<<--

are you adding any salt to the tank for the mollies? Most plants do not like salt. I think vallisneria will tolerate low levels of it though.

thanks for the replies. Great site by the way. Just for the record, it's a 17 gallon tank. From what I gather as a result, seems its to do with low nitrogen levels, so will have to buy some more fish soon. Thanks for the help once again.

Hi,
Actually, I'd give some thought to NOT purchasing
additional fish. 17G is considered a "small" tank and
assuming you have a mix of genders, it will not be long
before you will need either more, or larger tanks.

Give some thought to what you have and how you like the
current tank with its current occupants. If you are (were)
satisfied and just wanted greener plants, then I would go
the fertilizer way rather than trying to cram more fish
into the tank. Lightly stocking a tank, and feeding just
what they need is the easiest way to successful
fish keeping.

Read the site I included in my first post, and purchase
a bottle of either the Flourish, or Tetra, series of
fertilizer that will fit the needs of your plants.
Dose the tank with that, carefully following the
instructions and keep the light on for no more than 10
hours. Change the water every couple of weeks, and
vacuum the non planted sections with each vacuuming.
Give it a month, and see how things are going.

Frank


-->>> The Confidence of Amateurs, is the Envy of Professionals <<<--

Most plants from what i have learned will turn yellowish when they are not supplied with enough iron. When this started to happen with my dwarf chain sword, i simply added some aquarium fertiliser and they had gotten their proper color in just a few days.

Good luck with your plants.

Renegade545,
king of the frontosa