I have had a BGK for about 6 yrs. How do I tell the gender, always been curious. There is 1 white stripe on the end of its tail fine that is vertical in relation to the body.. I have a "home" in the tank for it. But the older it gets the less it seems to use it? It spends most of its time laying in the bubble stream from the power head.. never seen that before. Its in a 55 gal tank. New to this forum. Thanks!