Okay, MAJOR upgrade! I found a rock. A big one. And I put it in the tank (after washing it a lot). It displaced about 3 gallons of water. Now I won't get as many plants, but I'll definately get plants that will attack to rocks. I'm kind of afraid it'll put something into the water, or lower the PH or something but it shouldn't be too big of a deal, right? Here's a pic. The water's a bit cloudy cause I stirred up the gravel but I put another filter in.