I have a 20 gal. tank. It has a 20-30 gal pump, a current fan (not using), thermometer ( reads between 78-80), 20lbs of live rock, cleaner shrimp, scooter blenny, 2 banggai cardinals, 1 pajama cardinal, turbo snail, small green galaxy coral and a pulsing pom pom xenia. We use R.O. water. I feed...