frogspawn not looking too good

[canadianbudz604]

Well, its mouths on all 6 heads are showing, its not closed up, but its shrinking at a very fast rate. I have a 10g with 96w quad cfl. It was doing fine, I tested my water params and everything is good. I've change a gallon twice in 4 days, and I use rodi water. Flow hasn't changed and everything else is good in the tank. I added carbon and chemi pure to the tank last week, but took it out today because it hasn't been doing well since. Today, I put new carbon, and some filter floss. What could be the problem here?