The fishes seem okay, haven see any agression so far but have small harmless chase (read from nano reef on their aggressiveness towards own species, but can't find any info on the black dot fish).Hope it will stay this way. Only have a eden501 canister behind. Might be planning on a skimmer but not sure if it is overkill as I change water weekly. But any advice on additional filter that I need? But evaporation is a major problem I m facing now, trying to look for ways to top up either by diy or commerial product means. Will be good if anybody have good recommendation. Ya think am too greedy on corals, cannot resist. Will take more care on the calcium level.