If you do go with a crestie, an adullt WILL outgrow a 10 gallon. A full grown adult needs roughly a 20 gallon tall or bigger. You could always go with PDF's. Dendrobates tinctorius and Dendrobates leucomelas are both active, diurnal species. You could have a trio of either species in a 10 gallon; they are mainly terrestrial. Just make sure you read up on their care prior, they are low maintenance animals as long as their husbandry is in order. Heck, the fruit flies they eat are near self sufficient and easy to culture.
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