I used to have a hammer and a frogspawn in close quarters in a 30 gallon, neither of them ever extended their sweeper tentacles or exhibited violent behavior against each other. This was however only for about a three month timespan.
If you are moving them I woudl only suggest just keeping a close eye on them to see what happenes, hoepfully you could move them apart if any warfare starts.
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- Greg
90G : Light - Tek 6xT5 | Skim - EuroReef RS135 | Flow - 2xVortech MP40W | Control - Reef Keeper 2
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