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Nice job!
must be a well planted aquarium.
As for the species, you described the morphology of every baby fish (big head, slim body), although the behavior gives it away a little. most schooling fish fry will be pelagic (in the water column) while newly hatched cichlids and catfish will be more benthic (bottom dwelling).
At first I figured you had a baby cichlid, but I think it's likely a catfish (got cories?)...
I'm not sure ottos have been bred in captivity -if they have, its not a commonality. That would be pretty cool if they did though.
Congrats on the great husbandry! 



As for the species, you described the morphology of every baby fish (big head, slim body), although the behavior gives it away a little. most schooling fish fry will be pelagic (in the water column) while newly hatched cichlids and catfish will be more benthic (bottom dwelling).
At first I figured you had a baby cichlid, but I think it's likely a catfish (got cories?)...
I'm not sure ottos have been bred in captivity -if they have, its not a commonality. That would be pretty cool if they did though.