Not sure if this is even possible. If you nano has a filter the little criiters will easily be sucked into it. In nature small water critters would generally be found in small ponds with very little water movement.
Why don't you do your nano with a few small fish like Killies and then put a bucket of water outside in the shade, you will get lots of mosquito larvae to feed the fish with. Or you could start a daphnia culture or something?
Regards
Cameron
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