hi trying to figure out what is wrong with my JD he is rubbing against rocks and twitching, there is no sign of ick, so idk whats wrong, the 2 other fish in the tank seem fine but idk whats up with this one, hes just not acting right and he doesnt eat, well he does but he eats very strangly, he will eat the food then spit it back out but only does this half of the time when i feed him, any ideas as to what maybe causing these behaviors