It's going to be touch and go for that size tank, especially with the Maroons guarding the territory around their anemone (IE, the whole tank)... With mine I had to sell it to Steve because it was growing so fast - I think it will fine in his 300 for a long time to come.
A 55 is too small for those fish, you're right. Your friend would be OK with his 67 gal if he didn't have the Maroons - a CBB would do alright in that tank if he is the King, and put with smaller, docile fish. This has been my experience.
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Alan
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