Did you get an algae bloom after removing the plants?
Check out aqadvisor, but beware, my angelfish fouled up at least twice as much water as one of their adult angels, so it's very much just a rough guide, very rough, needs lots of improvement.
According to them, even if the RCS were adults, you'd only need to change like 2 gallons a week, at most. You'd be at 72% stocking capacity. You should figure out if their calculations are correct and get back with us.
The angelfish I have that fouled up at least twice as much water as one of their adults is about the size of my hand, thick as a finger, about. I guess an angelfish can be considered, adult, when it's much smaller.
Anyhow, what I'm wondering about, in regards to your situation, is how important an air pump might be.
Last edited by mef1975; 02-17-2014 at 01:13 AM.