Most of clownfish except maroon (maybe) would most likely host frogspawn, hammerhead, toastool, hairy mushroom and flowerpot corals as a subtitute for an anenome. False and true percs clown will host whatever they want in the tank...eventhough you have the listed corals above in the tank...they might choose a powerhead, piece of liverock or veggie clip ect... You just never know but if you have one of those corals, they'll mostlikely choose it to host it in time . They will not jump to the coral right away so be patient.