I dont think so. Some might not hurt in general but not too much as it can cause alot of film algae growth. Your system isnt really low nutrient or anything right? They can eat some stuff but absorb it through their cells also.
of course i overfeed because i bacteria dose but i feed oyster feast every other day and coral frenzy 2 times a week. its not really necessary just helps growth.
I guess I thought you meant only phyto. I feed smaller stuff also but for all corals and fish not just zoas. I have some brightwell planktivore but it stinks like fish so I wont buy that again,lol. I also feed reef chilli once to twice a week(good stuff and dont let the price scare you, it goes a long ways), sometimes freeze dried brine and cyclopeeze.
For now I'm feeding the whole tank Rods Complete 1x weekly. I'm actually trying to find out why I have such bad luck keeping them alive. A few do ok but the majority melt away All my LPS's are doing great. So I was wondering if there is anything I could do to help them survive, hence the phytoplankton.
Zoa feedings? 
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