Thanxs Innovator - that was sort of what I was afraid of. I have experience at raising cichlids and I had to gravel clean the tank everyday - not something I can do for the sw
tank. I do have a removable surface that they can spawn on but they choose not to use it but rather to spawn on the calcium desposits on the glass LOL!
The eggs hatch like clockwork on the night of the 9th day since the spawn. In Joyce Wilkerson's book she says her clowns always hatch on day 6 or 7. I think because my temp is low (79* to 80*) that that causes it to take longer. The transition from spawn to hatching is like clockwork - on day 2 they turn from bright orange to dark brown, on day 6 the "whites" of their body are visible, and on the night of the 9th day they hatch. This is their 15th or so spawn btw.
On your (austinsdad) question on what makes me think other critters won't get hungry (and eat the larvae), that's part of my question on what dangers are there to raising the fish in the tank of the parents. From what I understand, the parents themselves may/could eat all the larvae so it's a real concern.
I believe raising percula clown larvae has been done many times, so I'm not venturing in new territory. In fact in the Jan 2008 TropicalFishHobbist magazine, page 104, they have an article on rearing clowns (but, of course, in a separate tank).
Thanks everyone for your feedback - it really does help to exchange information. I'm still not sure if I'll try to feed the larvae; no matter what it was a great learning experience to culture microalgae and to culture zooplankton - I have five tanks for all the culture and would need two more!!