i have a 55 gallon saltwater aquarium. has been set up for 2 yrs now. i have in it one yellow tang, 4 damsels, two brittle star, one Coral Banded Shrimp, 8 assorted turbo snails and a few crabs. i have a fluval 404 plus 2 penguin 330's wth bio wheels and a seaclone 100 skimmer. also have...