Ok, so recently I had an overstocked 5 gallon tank with 2 cory cats, 1 betta, and 1 mystery snail. Naturally, my ammonia levels were all very high. I've since dealt with the overstocking issue and moved the corys into a much larger tank, so now I just have a betta and a mystery snail in the 5 gallon. After several days and several water changes, though, the total ammonia levels have not changed. That being said, there is no free ammonia to speak of.
Any advice?
Any advice?