I want to add a mystery wrasse to my rsm 130. I have 2 true perc clownfish right now and thats it. Now everwhere I read they say the mytery can be in a 30 gal. tank. Would this be ok to add the wrasse. Also the guy at the lfs said they are known for nipping at clams but I haven't found any evidence on the internet. I don't own a clam right now but I would like to in the future. Thanks for any help.