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a syringe with the needle removed would be fine for stuff like zooplankton and pytoplankton. I use a clean pipette, because I had a supply new ones from my fertilizer order (I keep planted FW tanks too)
for the polyps and soft corals you really don't need to feed via target feeding, you can just pour in the phytoplankton, so long you shut off the skimmer for about an hour. Target feeding your LPS isn't a bad idea though...