So one of my tanks has this iridescence on top of the water. Some sort of film. While my fish was in another tank it cleared up but hes been back in this tank for three days and its back.
Its a 10 gallon filtered npt with gravel. The filter is the Tetra Whisper 10i and plants are Swords, some sort of Hygrophilia, a little Rotala, Green Hygro, a ton of Wisteria and two moss balls.
My other tanks have never had a film on them. I have a five gallon without a filter and another 10 gallon with a sponge filter. Both Planted. Could it be the gravel? A plant? The filter? I do weekly water changes sometimes more and rinse out my filter once a week. I recently switched to Prime water conditioner from Aqueon. I put a little Stress Coat Plus in with water changes because hes coming back from a pretty bad case of fin rot. My params are back to 0 nitrites 0 nitrates and I keep ammonia under .25ppm. Ph 8- 8.5. gh and kh both 300ppm. They are the same in the other tanks without the film. Anyone else have this problem?