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Bugger, you mean detritus not dirt. Hapacticoid do eat a lot of detritus, but the pelagic species don't. There are huge differences between the group. The reason why tanks normally have good population of hapacticoids is that they are benthic and almost never leave the substrate or they don't venture very far, and have benthic or semi-benthic nauplii. This on reason they are mostly worthless for culturing fish. The other is that they are nowhere near nutritious as most calanoids and cyclopoids.
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Andy
"If we knew what it was we were doing, it would not be called research, would it?" Albert Einstein
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