i have 2x15 watts pc lighting in my ten gallon. The guy at Big al's pet store told me that for my 10 gallon 30 watts is more than enough... i guess he was wrong... what kind of lighting are you using to get 40 watts of light into a 10 gallon tank. I was going to get a 15 or a 20 gallon but this is my first planted tank and i wanted to do a smaller set up. Should i just do a diy hood that would just hold up my current pc lights and then add a normal table lamp? Anyone have a better alternative or should i just stick with my set up and grow low light plants? does anyone know why the watts per gallon principle doesn't apply to tanks 10 gallons and less?