I have a 40 gallon freshwater tank with 5 red minor tetras, a weather (dojo) loach, 4 giant danios, 5 black skirt tetras, a pictus catfish, a yoyo loach, and 1 blood fin tetra. I'm running an Emperor 400 and two internal Whisper 30i filters; two airstones, and a U.V. sterilizer. Now down to my...