Hello every1, i have a SA. Alls i can describe this spot as is like a black and blue. Its on the top of his head at the back, like right before the body starts. Color is like purplish-black. Due to swimming like crazy and hitting the glass? im not sure becuz I've never seen him flip out like Ive read sum people talk about. Sumtimes he swims fast when i clean the tank or put the net in the tank but no ramming into the glass. Any ideas?