I dont know if anyone is familiar with corn snake x milk snake hybrids but i used to do that while ago. The theory behind it is that your first batch (F1) are nothing special at all but when you mate 2 siblings of your F1 generation thats when you consentrate your genes and start having good looking snakes. i was wondering if this would apply to cichlids as long as there is a close enough relationship so not to produce sterile offspring. Also would all south amarican cichlids be able to interbreed and have fertile offspring?