The accepted doctrine that I've heard is that generally speaking you can keep multiple individuals of fairy wrasse as long as you don't have two supermales of the same species together. Not sure if supermales of different species would be a problem or not, though.
FWIW eggcrate is not a guaranteed fish stopper. I have eggcrate over my 30" tall 115g and I still lost my canary wrasse earlier this summer to jumping. I don't know if he fit through a square (I thought he was too big) or whether he jumped with enough force to lift the eggcrate and allow him to pass through and then the eggcrate fell back down exactly in place. The eggcrate did not look disturbed at all but I found the fish on the floor right in front of the tank.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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