@ agro - thank you for the info. I do not have any platy, I know that mollys are related in the fact that they are both livebearers, but i already moved my mollys out and back to their tank (i had them in there to eat hair algae and produce waste). I waited until seeing maximum oxygen production from my plants, this morning it was clear to me that the tank needs no more daytime air but i will still run at night when lights are out. When I first started the set up i was running a long air stone bar across the substarte, but as the plants began to establish themselves and produce visable amounts of oxygen i began greatly reducing the amount of air pumped into the tank. The substrate is capped with gravel but has third layer which is coral sand (sifted, rinsed and strained) which I think will be fine for P. kuhli ( if there is anyone who thinks differently feel free to explain). As far as filtration goes, I have built my own gravity filter which is fed by a sub pump (200gph). The medium is cinder stones, gravel (fine and med) and runs through a series of plastic baffels and carbon before depositing into the rock medium. I shall post my design when i get home.
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