I have 2 percula clowns, a spotfin lion, yellow tang, and a recently introduced coral beauty angelfish. Also I have an emerald green crab, several hermits, 2 turbo snails, coral banded shrimp, and pepermint shrimp. We check salinity daily, and check all others about weekly. As to the specific kind of filter and protein skimmer we have, I am unsure, my husband does the upkeep on the equipment, but could find out. also a powerhead to keep water circulating. Always do water changes(about 10%, or more if needed) approx. every 2 weeks, according to need. All fish had been in tank and doing well for several months before sailfin was introduced. The sailfin just got bloated, stopped eating, and hid all day in the rock(approx. 30 lb. of live rock). Just thought maybe he was sick when we got him, but now maybe something else with our other loss.