Ive been noticing some weird behavior after lights out.
Atleast one shark is much more active, even when the lights are on, and this has been its way since Ive had it for almost two years now. But when the lights go out, hes like flipper. Ive seen him almost propel himself out of the water. If this were a normal tank, hed definitely be carpet surfing. At first I thought it was stray voltage, but checked that with a volt meter and no. Then ammonia and nitrite, nope. Ph, no. I did a close inspection of the actual shark and there were no visible injuries, or parasites and hes developing decent clasper size and putting on weight, so hes maturing sexually and there shouldn't be any internal parasites, because I also just prazi'd the entire system several months ago.
I cant figure the behavior out, and I wont lie, at first it had me worried. I was sitting down there in the dark like a mad man, lol. That's when I observed him doing Flipper, flapping his tail so hard and fast that he was literally propelling himself out of the water. Like walking on water.
The only thing I can think of is its a naturally more active shark, as I said its always been more active, even during the day. Now that hes put on size and strength, his activity is more noticeable? other than that, it still has me very worried.
Any ideas? Tonight I will try to get it on video. It starts almost exactly after I turn off the lights.