It would be unusual but not totally unknown for the babies to make it in a reef tank, and it says very good things about the biodiversity of your microfauna that they are metamorphosing on what they can find to catch and eat. Odd, though, that they are coming out at night since they need light to target prey. I'm guessing you have a moonlight?
Anyway, once they turn orange they are on the road to adulthood. For this batch, once they are 1/4" long or so -- which will be another week or maybe two -- you could scoop them (with a cup, not a net) and move to a separate tank filled with water from the parent tank and proceed from there.
Or not. Whatever they are catching is nutritious enough to see them this far, and that's a challenge. My concern at this point would be running out of food, not the wrong food. You could supplement with BBS as Tomoko mentions.
If you want a science project, you could try to capture microorganisms in your tank using a plankton net and culture them. You may have a great larval food in there, like a very small and slow moving copepod.
Please don't feel bad about not trying to rear them. You just can't raise every batch, and in the wild, it is very rare for one to live to adulthood considering the numbers of eggs clowns put out. But clowns are lots of fun to raise since they grow so fast are relatively easy since the larvae are so large.