as everyone has said, a yellow tang should not get stuck unless he was not good to start with or extreamly small.
the positioning shouldn't matter at all as I had 6 of thoes types in my tank when it was running, I am a big proponant that your flow should be spread over as much of the tank as possible as long as your sand bed will alow it. I had two right on the bottom, two in the middle and two towards the top as I had a bare bottom.
look for a healthy yellow that is at least 3" in dia. and you shouldn't have problems
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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