Been doing some research on these guys as I will likely get a pair for my 20 gallon display, when I get it going finally. It seems that the hanging out under ledges and in quieter areas is a natural behaviour for these guys, so I plan to build some ledges into my tankscape for them, and there will be some seagrass for them to hang out in too.
They sure are cool fish, and beautiful too.
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Calvin
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Planning a 29 gallon mixed reef...
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