so I’ve had this bass for close to 7 years about a month ago it started to lose some color and darken up. It also doesn’t swim around much just kinda hovers in the one side of tank. When I feed it will come and eat no more than one massivore pellet. Not sure what could be wrong shoes no signs of anything I’ve never seen anything like this before almost looks like it’s old and dying. Can anyone help? Parameters are spot on he’s in a 400 gallon with other bass and rays and they are all fine.

