Hi! Most of my zoas are not opening any more. One day I found a orange and black something on one of the zoas that was causing a cob web. I remove this thing and and the zoa got ok, Since then I have found several. My wife have remove 5 today, but they are beige and bl and or. in color. They are the same size(.25 in) to .333). They kinda roll up when you use the tweezers to remove them. I think this is whats going on with the zoas. Any thoughts on how to rid my tank of these tiny creatures.