high school's 90 gallon
so in my high school, we set up a 90 gallon. we added a lot of plastic plants and driftwood. as of two weeks ago, we had 20+(we got a few extra) neon tetras, 2 bristlenose plecostomus, 6 hatchetfish, and 2 otos. slowly, fish started dying. i checked the ammonia and it read 4.0 ppm. i changed about 60 gallons of water and brought it down to 1.0. by the time that was over, the livestock was down to 12 neons, 1 bristlenose pleco, 1 oto, and 6 hatchets. what i'm worried about is leaving the tank on its own with ammonia at 1.0 over the weekend, i know that there will be at least one dead fish when i get back on monday. i hope to get it from 1ppm to as low as possible with ought hurting the fish. anybody know of a way to keep ammonia low? i know water changes is one, but any others?
there's a difference between a freshwater and a marine hatchet-fish. one looks cool, the other gives you nightmares.