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"Must" is probably too strong a word. They are classifeied as herbivores. They "can" and "probably" do better if supplied a variety of food, including meaty food. I feed my 4 tangs IO gel food marine blend as a base food, seaweed maybe once or twice a week. They have grown in size and girth in the two years I've had them on this diet.
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Anything I post is just an opinion. One of many in this hobby. Believe and follow at your own risk of rapid and complete annihilation of all life in your tank :)
Current Tank Info: Incept 3/2010, 150 RR, 50g sump, 20g fuge, 150w 15K MH x3, T5 actinics x8, moonlight LED x6, 1400gph return, Koralia 1400 x4, 300 g skimmer, 4 tangs, 2 mandarins, 2 perc, 6 line, 3 cardinals, 2 firefish, SPS, LPS, zoas, palys, shrooms, clam
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