DO not mix the dart frogs. I see you are from pittsburgh. Can I ask what pet store you are buying them from. I vend at the pittsburgh bird and reptile show and sell to a couple of people who own pet store up there. I Live about 30 minutes from pittsburgh in WV
1/4 inch is about the size I sell the to the pet store at.
Mixing is a big no no. It causes stress on the frogs and you would probably end up with dead frogs. Tincs are more aggressive then leucs and the leuc would probably be the first one to die.
Some people do mix but in very large tank with alot of experience. And you have to really know what you are doing.
I will be vending at the sho wnest weekend on the 20th in cheswick. I should have azureuz, cobalts, green and black auratus and maybe some leucs.