My male ocellaris has noticeably been laying down in beds of algae (I currently have an algae issue). He will come out and swim about but he uses his pectoral fins more than he used to. He eats and does his little dance with his lady and just seems fine other than not being able to swim well. We have a Saddleback clown in another tank who is believed to also have a swim bladder issue. What causes this? The ocellaris was fine until about two days ago. Is there something that fixes it or prevents it?