I have a 55 gallon and currently holding 2 male (about 3-3.5", just started to call actually ) White tree frogs. We got a shipment of whites in today at work and I fell in love with three of these little guys.

So my question is about what size can I add them to the tank with the other two? These three little ones are about 2", much smaller than the other ones but not small enough to swallow.

Would it be ok to add after their quarantine?