zooplankton is a pretty broad spectrum term that covers everything in size from rotifers (barely visible to the naked eye) to cyclopeeze and tigger pods (large enough to make out anatomical structures), to potentially even larger animals. The term plankton just means that the organism is small and does not have the ability to intentionally swim (i.e., even if they can move at the micro scale, they're still completely at the mercy of ocean currents). SPS corals do not all have the same sized polyps, and not all consume the same size of food. Some zooplankton will be too large, some zooplankton might be too small.
Really the terms zoo and phyto plankton only mean that the thing is either a planktonic plant or animal. Saying you should feed corals one or the other is on oversimplified way to look at it. That's like saying they should either eat meat or plant, when in fact they are likely opportunistic omnivores adapted to a specific particle size.
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