The
ADF - the Dwarf, not large growing clawed frog, love to have friends to lay on top of and hang out together.
A 10G would be fine for 3
ADF.
The wide more arrow head shaped ones are female and the more evenly shaped body ones are male. Males will make a tiny odd electronics type noise you can hear them on youtube and they will call for the females. So cute.
Making sure they get food, it is important but with such small fish and not really in direct competition like say a Cory might be, you should be fine. Just keep up with water changes.
They are adorable!
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New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?

Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves