For the big one, its because the tank has a hole drilled in it, used to lead to a sump right underneath but its apparently leaky. So I only fill it up to below it. I actually wanted to turn the hole into the intake for my filter if possible but that involved effort, a visit to home depot and...more effort? Its nice though because I have pennywort growing up from the water that way.
For the 20..well... evaporation. Laziness. Ahem. I keep open tops so it drops pretty fast.
V that would be cool! Its funny, all the plants on the bottom grow soooo slowly, but if they ever manage to hit the upper half- they start growing like crazy.
Last edited by VivaDaWolf; 10-01-2012 at 11:20 PM.