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Currently I've been dosing silica and I'm pretty sure my copepod population has increased due to this. Diatoms are, generally speaking, a more accessible and usable food source for zooplankton. Like you said, at least the amphipods eat all the rotting gunk detritus mix.I mean amphipods are less for fish food and more for cleaning. They are by far the best detritus, sandbed, algae, rock cleaners that you can put in your tanks. With that comes their voracious appetite and breeding habits though.
They also will definitely wipe your copepod population. I was adding a few thousand copepods a month which would disappear in two weeks. Now that the canary wrasse is doing it's thing, I'm finally seeing copepods again.