I have a 70 gallon tank started 5 weeks ago. It has a 100 gallon filter, live plants, airstones, and at the moment has 3 fancy guppies, 2 dalmation mollies (a male and a female who seem very sick), 5 platys, 3 glass catfish, 1 cory catfish, 5 neon tetras, 5 glofish, and 4 glass tetras. The...