I cant do a dip as they are attached to my rock work. do zoas sometimes just close up for no reason? the bacterial part, where would it come from if so? my sump is in the garage but we dont do anything in there and when I did a water change I checked in the sump to make sure there was nothing in it that wasnt supposed to be.
How can I tell if its bacterial?
will they shrivel up for lack of food?