First post here, I'm having problems with my 90g lightly planted community tank. I have 5 angels, 15 mixed tetras (I think) male and female Bolivian and German blue rams, 3 Otos, 2 female and 1 male red hump Geos, 1 cory, and 1 leopard pleco. The water has always been 0 ammonia, nitrate...