It should be out of range of anything else other then like corals (Torch, frogspawn, hammer, maybe bubble) some can have sweepers that are 8 inches long. most are shorter then that, i'd just observe how far they reach before moving it closer to anything or moving something near it. Some, like the one i currently have don't engage other corals, get it's luck of the draw, but i haven't seen mine extend any sweepers yet, if it does my kenya is probably toast.