Euphyllia species are one of the easiest and most interesting Corals to make mixed colonies of. Would only suggest mixing similar growth types meaning branching with branching and wall with wall to keep from overgrowing. I'm just now reintroducing them into my system and have started to collect E. parancora and E. paradivisa in mixed color morphs to make a large colony to go into my new tank upgrade.
Had Hammer for months and just recently added a Frogspawn about 5-7" away from each other and doing well, no stinging going on. Would like to add a Torch but I will probably put this away more. Good luck.
I agree... Frogs and Hammers are ok from my experience...
My torch though i have to keep away from my Frogs... I've witnessed stinging from Torch to Frogs... Not to my hammers though.