[INFO: 5 gallon tank, (6th week of cycling) 4 zebras, 2 long finned, 50% weekly water changes, heated tank with a bio wheel filter (I've not yet changed the filter) water params: PH 7.6, Ammonia 0, Nitrite 10, Nitrate 80. Also, I noticed a kind of slime or something hanging off my ammonia alert card that hangs in the tank.]
All but one danio are hanging out at the top of the tank in the flow of the filter - the other one is chasing everyone else around the tank like crazy and some have a reddish tint to their gills. I'm worried - are my danios sick and what should I do?
Thanks for any help