haha i had this same problem in my tank hat has a lionfish in it....everything was covered in bubbles...its not really a major problem....i just poked at them with my feeding prong...(seeing how its a lionfish and im not putting my hand in there.
lol) and they went to the top and popped...i havnt had the problem again...i also had a horrible hair algae problem, but it seems line once these bubbles started to come....the hair algae stopped growing and now everything is turning purple... =] my heater is covered with coraline algae spots....it looks like it has a weird disease. haha =P