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All od the Euphyllia corals (Frogspawn, hammer, anchor, torch) pack a poweful sting and have some pretty long sweeper tentacles that will extend at night (like a Galaxea/Tooth coral.) They should be at least 12" away unless you keep current blow on them so that the sweepers are kept away from other corals. I have a powerhead blowing at the large galaxea and frogspawn in my tank. The sweepers are kept blown toward a side wall.
Gary
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano