I have a 40 gallon breeder set up with a Fluval 306 and a 300w heater. My temperature is steady at 78 degrees F I have 3 guppies, 6 zebra danios, 8 neon tetras, 2 cory cats, 1 red platy, and 2 sunburst platys, and a bristlenose pleco. The cory cats have been going up for air lately, but ive...