Here's the two in my 120g. Some users may not agree with how I started with them.
I got them when my dt was fallow, fighting ich. I had a QT going with my fish but had medications in the tank and didn't want the mandarins with them. They both lived in a 5.5gal for about 2 months. It wasn't ideal but it was the only spare tank I had on hand. I think I put in about 20oz of bottled Copepods each month, supplemented with frozen brine and Mysis, and used MarineSnow every few days. They thrived. While the DT was fallow, the Copepods and Amphipod population EXPLODED... it was pretty creepy seeing them everywhere! Anyhow, I put them in the DT when they were ready and they have become nice and fat and just enjoy the day looking for food.
I'm pretty sure I have a male and female. They get along but I haven't seen any type of mating. Do they mate easily in captivity?
I can probably get a better picture up tonight:
PS my source for copepods is Canada Copepods