If your talking about
saltwater fish, they are moderately hard to raise depending on how much experience you have with saltwater fishes.
They will eat fish flakes (SALT WATER FISH FLAKES ONLY) and they are non aggressive type
They can stay with tangs, Dory, Nemo, and Emperor Angels
They love having the light on all the time, and I am thinking that you should do some water changes about every 3-4 days, and siphon the tank every week

it helps get rid of the poisonous toxins in the tank, and if you have any corals, or
anemone and if you put the Nemos in (clown fish) they will possibly live in the anemones
I hope this helps you.