12-15-2009, 07:36 PM
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In addition to the info asked by Angel, what type of light (presumably fluorescent, but what make, name and wattage)? And I'm not sure what the "white stuff" refers to, can you post a picture?
But a couple of things do jump out from your post. First, substrate fertilization is next to useless for the plants you have named in the "main 10g" tank. None of those plants have extensive substrate roots, even the Wisteria which does develop good substrate roots also has roots along the stems, indicating it absorbs nutrients mainly from the water column. While I'm not certain as to how much nutrient would leech into the water from tabs in the substrate, they are wasted, though they may be useful to the algae.
As for Flourish Comprehensive (I assume it is the comprehensive product), dose the recommended amount on the label, no more. It is very effective fertilizer. While all this may balance the light [more on this momentarily], it probably doesn't balance the carbon (from CO2 from the fish) unless the tank is heavily stocked with fish. And the light is certainly more than I would use over a 10g. Fifteen watts is plenty; 30 watts over the new 10g for the higher light plants won't achieve anything if the carbon and other nutrients are inadequate to balance. Your light schedule will tell us more.