Mandarin won’t survive in 20 gallon

Please return the mandarin or find him a suitable home ASAP. He may look fine for now…but he will starve to death in 3 months tops UNLESS you are buying LARGE quantities of pods on a regular basis to feed him (or her). There is no way a 20 Gallon tank can support the pod population necessary to keep him alive. (none of this applies, of course, if you have successfully trained him on frozen mysis…which is very rare and lucky) Of course, you might be able to keep him in a 20 if you had about a 100 gallon refugium stocked with pods and hooked that up to the system. Please do research on these gorgeous animals feeding requirements. WEtwebmedia.com is an excellent source of information. Best of luck in finding him an appropriate home and glad to hear your other tank mates are doing well in such a small space.