I just moved this zoa colony from another tank to my new display, and noticed this large and thick purple sponge growing on it. It is starting to take over the zoa rock. Aside from manual removal, are there any other options for removing it? Ideally I would like to get some type of critter that feeds on it. Also, wondering what type of issues this type of sponge can lead to, and just additional general info. about it. Thank you.
