if you want to start a phyto culture you'll need to order live phyto of a quality that is needed for starting a culture. Pastes and dry stuff will not cut it. You'll need the watery stuff... preferably from a decent reputable source. And think about what phyto you decide to use. I personally prefer the stability offered by a tri-mix of different phytoplanktons. I also avoid pure nannochloropsis solutions... the nutritional profile of it is poor and it has a thick cell wall. you probably don't want to do a culture at all though.
IMO filter feeders like our corals (sps or otherwise) and worms do not benefit directly from phyto. If anything, the phyto is food for small critters like rotifer or copepods (the former only if you actually feed it) which proliferate with the extra food availability and serve as food themselves in turn. phyto is just too small imo. For this purpose you may use any kind of phyto in any form, but i still wouldn't choose a dry product or anything not refrigerated.
soooooo long story short, in your case i dont think it is at all necessary. you need to give them good water quality and environment (light, flow, w/e). food is not vital. If you really want to though, look for coral food like oyster eggs, or coral frenzy. arguably those products are less nutritious than the live food indirectly provided by real algae doses, but i think the convenience of formulated coral food wins out in this case.
also think about what the things will eat. example: SPS needs very small food whereas LPS like duncans will take anything from cyclopeeze to krill.
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