I have a 210 and i started with 3 and am left with just one. I don't know if it was due to starving or low survival rate but they do swim a lot so they need to eat a lot. As for them being in a 55 i don't see why not. Mine doesn't really swim around the tank alot it mainly swims in its own little area.
Not really sure though.
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210 SPS & 42 Hex LPS mixed reef
Just because they say you can't do it doesn't mean you can't prove them wrong.
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