I've had my Lima shovel nose for about six months now. He is right at 12" and Def one of my favorite fish in the tank but after he eats (around 30 mins prior) he starts jerking around and spits out a slime substance. Sometimes only once or several small ones. Sometimes he eats it again and then spits it back out a few mins later. He has done this since day one and seems to be in great health. I feed him krill, silversides, beef heart, squid and any other frozen fish I find at my LFS. Water perimeters are excellent. Is this normal for these fish? Has anyone ever run into this ?