Over the last month to be honest, quit checking. Just look at the tank.see red slime coming back, nits are up. phosphate too. Saturday, Change water, change carbon, tues Change water, thursday, Add Red Slime remover, Sunday change water, change carbon, Almost to the point of throwing up the white flag. But alot of my advice came from you know who. (I wonder if he will bring me back a T-Shirt from his next vacation, That is the least he could do) But I love my tank, It was once beautiful, and I want to try to save it.