Yeah, you can just feed it some Reef Snow, or Zoo and Phyto plankton. If you have cyclopeeze feed that, or crushed frozen brine, mysis or rotifiers will all go off well...
Feed it every second or third day max, and best way for such a small specimen is to use a syringe or turkey blaster and squirt food over it. It will take about 3 minutes to consume the food and then it will open up again and you can feed once more.
The more you can feed, the faster it will grow, so if you can feed daily it would just be so much better.
As mentioned before, if it is Chilli, which I do think it is, it is not too difficult to keep. Keep us updated as it grows huh???