Might the 42 watt light be too strong in a tank this small/shallow? I just ordered the same tank myself, and I've been trying to figure out what kind of light I can use.
I have this tank and ordered the same light as this for myself. I think a hagen glo single lamp 36" would be better but i couldnt find one for the right price. Its so shallow that i think you could prob get by with 21 watts and still get some decent growth.
The light issues for this tank are probably the only draw back to getting it.