And FEED your tank! Back in the mid 90's we were all in awe of the cool colored sticks in aquariums belonging to guys like Steve Tyree. How did we keep the colored sticks back then? Well, we mostly starved the tanks. SPS guys were funny, you'd say "Why don't you have any fish?" and they'd say "No way, my sticks will go brown". Then we saw the advent of powerful protein skimmers, beneficial water additives and filter media and SPS tank water got cleaner. So we'd start to see some SPS tanks start to "look" starved... the colors would fade and the coral would look "dry". So at that point the advice became "Add a fish" and that would help improve SPS color in systems with a nutrient deficiency. So for optimum results... if you're running a successful low nutrient system with ecoBAK, feed your tank!