Yes you can if they have rock work to hide in. You can even hide a piece of PVC pipe for them to jump into. The biggest hurdle to keeping mandarins is they require a large amount of live food. The people I know that have kept them long term and have produced fry have large fuges in their sumps for amphipod and copepod production. At one time ORA was selling CB mandarins that were already eating frozen, unfortunately they have discontinued production.I only ever had 1 mandarin and it was in a well eastablished 90 gallon. Unfortunately it wasted away. I have read threads on training them onto frozen but it did not sound like every mandarin is trainable and I really don't want to see another one waste away. I am successfully keeping an amphipod culture going but I am guessing that a mandarin could only eat the small ones. I really love them but this is sounding like its too iffy. I will probably stick with getting a CB bangaii cardinal instead.