I have had a mandarine in my tank for 14 months. She did breed with her mate but other inhabitants made short work of the fry. I have subsequently lost him when I had a previously mentioned pH problem. She feeds on vit. enriched brines, flake, shark formula, copepods, bits of stray muscle, squid and anything else that takes her fancy. The only problem she has is she is as wide as she is long. I feel alot of people forget individual variation within species, hence natural selection. I dont condone the mass import of species and do my best to recycle, ebay etc. but if there is an option to breed and grow on the fry then this can only be good for the hobby as surely only the strong and more adaptable will make it to adult hood??