If your talking about Discordipinna griessingeri, with the amazing yellow and orange colored fins, its a VERY hard fish to keep. They require feedings from 3-7 times daily and at that must be fed VERY tiny food...... Thats IF you can get them to eat frozen, try, artemia, pods, rotifers. They also are easily eaten if there is any CUC in the tank, hermits, even snails. Very pretty fish but IMO just one that should be left to the ocean. I would also suggest a seahorse like habitat, low flow, good sand bed, and no other fish. I would say a nano would be great for them but honestly I dont think it would have a good enough food supply. Good luck.