Well, I'm not sure they're eating yet... but apart from that, they're doing well.
Five of them are now over three days old; another five have hatched, but one of those doesn't look very good. He's sort of bent and his gills seem underdeveloped. We'll have to see if he starts looking better soon.

Here's a picture of three from the first batch with a one cent coin placed underneath the container, so that at least those of you who live in the Eurozone will get some idea of their current size:

The coin looks oddly shaped because of distortion by the water.

The red blobs are cyclops: water fleas. Too large for the larvae to eat right now, but it was worth a try. We'll try to breed them so the larvae can eat them later, when they've grown a little.

The tiny specs are sea monkeys or brine shrimp. Those seem more suitable.
In fact, stoneshop  just told me he saw one of the larvae eating them. W00t! Now let's hope this little pioneer will tell the others how to do that.