Today i bought some brine shrimp because i thought i should be giving them a varied diet instead of just feeding them flakes. I cut one tenth of the cube and thawed it out. When i put it in the tank, my 5 zebra danios and 2 platies ate it really fast. After they finished, i noticed that all my danios had big bellies! lol. They were slim before but as soon as they ate the brine shrimp, their stomachs bloated. I dont think i gave them too much though, it was only 1/10 of the cube. Is this normal? What do i do? Thanks 