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Possibly chemical competition (aka allelopathic toxicity)? Certain soft corals are quite toxic, and are known to influence nearby corals/ certain species. If not using activated carbon, might be worth a shot...
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7 reef tanks, 5 freshwater tanks, 2 terrariums, 2 dogs, 3 boys, and 1 very understanding wife!
Current Tank Info: Marine: Pair of 40B's, 45W, 50g cube, ADA 45F at home...IM Nuvo 20 and 10 at office!
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