is my chaeto thriving on any of the bioplankton that i am dosing for my corals?

If your question is for real, chaeto does not use things such as plankton to live. It survives on the nutrients that it receives from your water column...like nitrates which are a byproduct of all the creatures in your tank. That is why it is very common in refugiums to use up nitrates so that they do not build up in your system.
 
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