A couple pics of the the Mylossoma duriventre I brought in a while ago; came in at maybe 1" with no colour in the fins and vertical tiger-type stipes, with a single occelli in the middle of the body. Their colour has really come out now that they're 3"+ in the anal fin. I just moved the largest 4 in with my shoal of 20+ red hooks and 4 schomburgki. Also included a single pic of one of the red hooks (not the easiest fish to get good pics of when there's so many in a tank with no backing!).
