Interesting question. I think feeding zooplankton is a great idea in general. In nature, all corals (including Acropora) feed constantly on live zooplankton, and require feeding.
I can't say it better than this paper did
Heterotrophic feeding in newly-settled coral planulae can potentially improve survivorship and accelerate early development in some species; however, an optimal diet to facilitate this does not currently exist. This study evaluated the efficacy of three ...
www.ncbi.nlm.nih.gov
The often stated hobbyist perspective that corals only need light is very much in contrast to the biological literature on the subject.
I know researchers who have used rotifers (like the above paper) and others who have used newly hatched baby brine shrimp. In some cases they feed these alongside phytoplankton, which are not thought to be directly eaten but serve to feed zooplankton in the tank. I havent done these experiments myself, but there doesnt seem to be a lot of controversy among coral biologists about it, corals need to eat and zooplankton is what they eat.
I think the biggest challenge is that we can't grow what they normally eat (a diverse collection of zooplankton). Rotifers and baby brine shrimp seem like the only realistic options I know of. I'd love to hear any other ideas.