I don't think i would do two unless they both went in at the exact same time. Mine is not a good option i don't think.. they will certainly have issues its not worth the risk. can't wait to see the new big tank bid. the other things is there meant to graze on age and be supplements with provided food. One can easily keep a 300 cleaned up i put a super small one in the 30 gal lips tank and he ate the bryopsis the first night and has picked the tank clean in a few days. they need a large tank to do well and you have to feed them once they clean out tank. id expect you have very little algae in the new tank so you will have to feed two an enamors amount of veggie if there a medium size. like one-two sheets a day sort of thing id guess.