Hello! I have a 75-gal tank that has cycled by Thanksgiving. Soon after we bought 10 fish and waited 3 weeks. Everything looked good, so we bought 10 more fish about a week ago. Right now we have 19 fish (6 glow tetras, 4 molies, 3 guppies, 3 ghost catfish, and 3 catfish). I have a Penn Plax...