I was wondering the same thing. I have a 29 that is somewhat planted with lots of rocks. I have my Calvus with them and I know they are invert. eaters. I have some cherry shrimp coming in the mail so I guess I will have to see how they do together. I hope that by planting alot that the shrimp can hide and the extra babies could get eaten. Oh and are the yellow ones you are thinking of yellow labs?