This is probably a newbie question, but there seems to be a bubble growing in the middle of my frogspawn. It first appeared in one of the heads a few days ago and has now appeared on another. The tentacles do not appear to be bothered and seems to be doing OK, although I have seen it look better. I would post a picture as well, except that I cannot get the pic to load right. If anyone has any experience with this and can offer some advise it would be greatly appreciated.