Well my 20g has never looked better, things growing, color, etc..
However, .... my 3g looks horrible. I have a red slime, and hair problem. Measuring no phosphates, and 20 nitrates. That alone should not be enough to cuase this but.. I used the water and rock out of my established 20g. I never really had a cycle, although it has a 2" deep sand bed, maybe that is still maturing. I think it was been set up for 3 or 4 months now. I have cyno and hair alagae I have not been able to get rid of. Tried throwing a towel over it for a few days with the lights off, that helped a little with the hair, but it came back. Maybe i should use no "sponge" at all in the back of the tank. Only have 1 maragrita, and 1 small crab in there. They arent accomplishing much Any suggestions? I could blow it up and start over it is small enough. I had no alagae issues in my 20g ever.