keep with the krill if possible, mine loves krill and he seems to be very happy during feeding time! Mine used to eat alot of krill, i would even hand feed it krill. Then it stopped. I didn't see it eat for almost 2 weeks, (but im sure it had to be eating scraps or something at night) i dunno if it was sick or what but within the last few days it has been back to normal again. and back to hand feeding!