07-03-2010, 03:47 PM
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Originally Posted by Byron
I'm with Mikaila31 on this.
What bones14 is referring to is known as allelopathy, and while there is evidence it exists, it is not, so far as I know, pertinent with species of Echinodorus (swords). Diana Walstad discusses this in a chapter in her book if you want to follow up, and Hiscock and others mention it mostly in passing.
You mention adding more light, do you mean in addition to the dual T8 tubes? I would not recommend this, as you will have more light than the available nutrients and that is going to cause algae blooms. Nutrients and light must be in balance to sustain good plant growth and keep algae at bay.
And speaking of nutrients, are you adding any fertilizers (liquid, root tabs, or nutrient-enhanced substrate material)? Even with the light you have, nutrients sufficient for all those plants (Hygrophila is a stem plant and all stem plants are fast growing plants which means they need sufficient nutrients) is unlikely going to be adequate from the fish food and organics. And you mention soft water, so any minerals that might be in the water will be non-existent or very low. A good comprehensive fertilizer like Seachem's Flourish Comprehensive Supplement for the Planted Aquarium is what I recommend, used once or perhaps twice a week. This, plus a photoperiod of 10 hours a day, with the light you have (assuming it is full spectrum and/or cool white) should be sufficient for good plant growth.
Yes, in addition to the existing lighting. I use Flourish twice a week.