I have some ugly purplish brown mushrooms multiplying in my tank. I received 1 as a freebie a while back and made the mistake of putting it in my tank. Now there are 6-7 of them taking up valuable space. Some of the bases are in cracks so I cant just pull them out. Will Joes Juice or vinegar kill them? Please dont tell me to give them to someone. They are very ugly. Thanks!