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Originally Posted by sumpfinfishe
Ahh the Tang police are starting to swarm, I can feel it 
I once read that Keith Richards from the Rolling Stones said that "eveyone should snort a rail a day".
Well just because one author tells you that a minimum requirement is 135gl to keep tangs then by all means, I thnk that is the rule of thumb we all must follow 
I have seen many tanks-most of which less that 135gl, and in many of these tanks there were more than one type of tang-usually two and sometimes three or even four. All of which except for the odd tank kept very healthy fish. Now I know that I'm no expert-only six years of reefing, but when I see a healthy fish-that usually means a happy fish  |
But have you observed your tang in a minimum sized tank of 6 feet and also its behaviour in a four feet tank. You would see a major difference in its behaviour. The bottom line is that tangs are swimmers and need the swimming room that longer tanks provide.
Also there is more than one author (Scott Michael) that recommends the minimums.
http://reefkeeping.com/issues/2003-03/hcs3/index.htm
Pocilipora The reference you gave is a commercial site. Their business is to sell as many fish as possible.
Canadawest There are things you can for a five foot tank.
Make sure there is a clear swimming area from one end of the tank to the other clear of coral and rock. Make sure there is an adequate turning area at both ends of the tank. Place a powerhead in the swimming area near the top of the tank. Tangs love to swim against the current and enjoy the highly oxygenated water the powerhead provides. Sounds like your tangs are happy and healthy