ya, I used to get ridiculous amounts of bubbles from my el-cheapo HOB
skimmer. However it is my understanding though that it takes a little time for one to "season" - I can say this from experience now because mine used to produce annoying ammounts of bubbles too and not only that but the collection cup seemed to fill up very quickly (if that is also the case with yours?) and after a while it seemed to calm down and not fill up so fast and not produce as many bubbles, still some but not at all like before, and the collection cup seemed to get actual "crud" in it. so ya, hope this helps.