I have a young WC pair of Alto. compressiceps that I've had for about 6 weeks. They have both eaten frozen brine shrimp, mysis and krill very aggressively up until about a week ago when the male stopped eating. He will only suck in the food and then spit it out. Sometimes he doesn't even do that. He still acts fairly normal, chasing the female when she gets close for instance, but I know this won't last if he doesn't eat. I had high hopes for this pair and hate to lose him. Any advice on what I should do to get him eating again?