It can mainly be found on oceanic drop-offs at depths of from 20 to 30 metres (66 to 98 ft) though it can occasionally be found in outer reef areas and lagoons at depths of from 5 to 35 metres (16 to 115 ft).

The recent discovery of Schindleria brevipinguis (called the stout infantfish) relegated it to second place.

Later, the discovery of Paedocypris progenetica dropped T. nanus to third place.

The record for the smallest known vertebrate being held by the frog Paedophryne amauensis, formally described in January 2012.

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