Ya, I think 40g is too small for any Butterfly. What about a nice Fairy Wrasse?
Also, keeping zoas with SPS isn't the best idea as the zoas release toxins that irritate SPS. Zoas have a tendency to take over like a weed too, and will sting and damage SPS. If you do try it, you will have to run a significant amount of carbon to absorb the toxins from the zoas, and large amounts of carbon are also known to reduce polyp extension on SPS. It's kind of a lose, lose situation.
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~ Mindy
SPS fanatic.
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