I am just about to set up a 27ltr tank and am thinking about having a single fish. I know that manderins require regular copeods to survive, but if I was to supply the manderin with them on a regular basis, by buying them and culturing them, would it be possible to have the manderin in this tank ? Is it just making sure they have a constant supply of food, or is the space an issue ? With this size tank it would also allow me to attempt to direct feed other food, and there would be no other fish to compete for food. It is one of the smaller, green spotted ones that I am thinking about.