Not to sure that rotifers (planktonic) are going to help with bio-diversity in your tank. For the most part they are a salt lake organism (like brine shrimp), that only survives for a very short period inside out tanks before they are either eaten, sucked over the overflow or die because of lack of phytoplankton in the water. If your interested I have a culture of these.
Benthic tropical copepods (ALGAGEN PODS TISBE) available at J&L would be your best choice if you were interested in adding pods for biodiversity as they can survive and reproduce in our tanks living off of detritus and algae.
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