I am currently considering getting a psychedelic mandarin fish for my 20 gallon nano tank. I know that mandarin fish are capable of consuming vast amounts of copepods in one day and was wondering what the opinions were on using a small hang on back filter with live rock, magic mud, and chaeto to produce copepods that are fed into the main display tank. I am hoping to buy a mandarin fish from the LFS that already accepts some prepared foods so that I can feed him directly with cyclo-peeze, brine shrimp, and spirulina as well as to try and culture copepods in a tuper ware container so that I could "pipet" some copepods into the tank when I felt populations were declining. What are the expert opinions on this setup? Am I alright or will I still end up lacking in the amount of copepods I will need?