Feeding corals?

In my experience, the best way to feed corals is indirectly. With a few exceptions, like the sun coral which needs direct feeding, most corals feed on zooplankton. You can simulate this in your tank by dosing phytoplankton. The phytoplankton is consumed by your filter feeders.

With an abundant food source, invertebrates in your tank multiply. The ova and the larval stages of their spawn are dispersed into the water column and consumed by the corals. Snails, copepods, and many worm species are good for this.

Cerith and nassarius snails will leave eggs on your glass (cerith leaves strings, nassarius leaves small clusters). There is practically no chance of them surviving to adult stages due to predation and filtration, but they are a constant source of zooplankton if your tank has enough algae to support them. Pods and bristle worms consume detritus, of which we all have a good supply. These animals won't need phytoplankton to reproduce.

Other animals, your feather dusters and other worms, small bivalves, and the like, are filter feeders and will slowly starve without a steady dosing of phytoplankton. Without enough energy (read, food!), they will not have the resources for reproduction.

If you maintain your own culture of rotifers, the juvenile stages are small enough to dose as an effective zoo substitute. Of course, this comes back to phytoplankton, as you can't culture rotifers without it as a food source.

 

I directly feed my candy canes, bubble and favia. I don't directly feed my frogspawn, zoas, blasto or sps. I do add a powder reef supplement. Honestly, I don't know what it is. It's made for my lfs, but it does the job. It has protein, fatty acids, etc. in it with particle sizes 5-50 microns. I feed this about every other day, just a small pinch.