Hi everyone,
I just setup a new 12 gallon tank on July 4, 2008. First of all, I have 15 Neons, 7 Tiger barbs, 6 Gouramis , and 4 angel fishs. The water got cloudy with Ammonia 4, Nitrit 0, and Nitrat 0 throughout last week 7/14-7/20; however, after I changed the 25 % water on July 18, water got...