add the nanochloropsis to the zoaea tank as a food source
Question? Your tank with the zoaea stays green? I would think think the nanochloropsis would die at that salinity?
Culturing may be somewhat of a task, you can buy DT's live phyto which contains that algae and another strand, though a bit expensive but it's ready to go. They come in containers up to 1 gallon if you would ever need that much but unlikely since the light source should make it reproduce.
Any decent marine LFS in your area should be able to get this product.