Yeah, I'm a bit concerned about the ammonia also. I saw it spike shortly after I added the cory so it could have just been adding the new guy that changed things for a week or so.
I've tested it twice this week and it's been back to 0, and the nitrates seem to be 0 also, so maybe it calmed down again. I would agree that my fliter isn't doing nearly what it should be. When I'm done moving, I plan on buying a better filter. I think I've given up on UGF's. The cartridges don't work that well...basically they seem to be keeping things from getting any worse, not better. The ammonia also isn't entirely out of control, but it's showing up between the 0 and .25ppm colors in the test kit, which is more than I want it to be.
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