I have a purple tang that always gets ick. I do nothing about it and it clears up in about a day. But I also run a UV sterilizer. Have you tried feeding them zuccinny. My tangs love it.
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120 Reef 2-250 watt MH 4-65 watt Actinics, 4-1w blue moon, coralife 220 super skimmer, 9w UV sterilizer, 3-maxi-jet 1200 PH, Fish I have; 2 yellow striped Maroons, 3 Lyratail Antheas, 1 Purple Tang, 1 Kohl Tang, 10 Blue/Green Chromis, 1 Fox Face, 1 fairy wrasse, 1 Bi colored blenny 2 sand shifting star fish, 1 green serpeant star, 1-brittler star, 1 queen conk, and 1 garden eel. 100lbs of live rock, 80lbs of live sand.
1-20gal reef
1-20gal fresh
1-55 gal fresh |