I have a Jaguar about 15 inches now, hes always been fairly mild mandered, in the last few days hes become really agrresive, even flaring his gills at myself outside the tank. I noticed a long white jelly bubble looking thing on one of his fins. Any thoughts??? could it be a mateing thing? hes around 7 to 8 years old and i havnt seen him this aggresive before. And it came on all of a sudden.