So I've read a lot about zoas creeping in on torches and such and can't seem to come to a definite answer. I have what i believe is a cristata torch up high in some rock that also hosts my growing zoa garden. It's to the point now where the zoas are even touching the tips of the torch a they flow in the current. Surprisingly I've not seen any stinging or receding from the zoas. Now my fear is this... will they overtake this torch?