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How about looking at the meiofauna community in a heavy vs. lightly fed vs. no food system?
The cost would be low. Maybe $100 if you already have the right equipment.
The husbandry would be minimal. You would have to top off and feed as needed.
Diversity is based upon number of taxa and number of specimens.
You could take samples every 60 days and see what changes in the community.
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