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To not hijack on Ben's scrubber thread: Brad you bring up an interesting point. Some swear by this food or that. I think too many have seen polyps close on something and the owner think that the coral is feeding. Hense the wide range of coral foods.
I stopped using them long ago after never seeing any difference between the added and what ever if anything of value comes out of the sump
On the other hand I know at least some corals can feed by direct absorbtion. How big of a role do you think this mode of feeding plays with the sorts of corals we mostly keep?
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