My friend has a betta and wants an albino clawed, before she does it, I know the tank is too small, they grow pretty big right? what other concerns are there? if it gets big i can always put it in my 72G lol
The concern would be that the frog will at some point (depending how big it is) be able to eat the betta. It is one of the easier fish to catch. You can probably keep an adult frog in a 20 gallon since they are not particularly active.
a 10 gallon is too small for an adult, but you can keep a juvenile in there for a decent amount of time as long as you do frequent water changes. Generally, they won't bother fish that are too large to swallow. Another precaution is to make sure you don't have fish that can damage the frog's skin (such as aggressive species of cichlids)