Pumilios taking down tincs? I find it a little hard to believe. But in reality they should really should not be in the same tank anyways. Pumilios are tough little frogs
I think alot of the people that do sell frogs are honest. Not all but alot of them are. And yes most dart frogs are Cb these days. I let every one that buys from me know if the frogs are CB, F1's F2's.
Hybridization is a concern and alot of people do not have the heart to cull the froglets, eggs, tads. Keeping the offspring and no selling them is not going to work long term. Most darts breed weekly. My smallest clutches being 1 egg and largest being 27. It is not going to take long to get over run and then the hybrid start leaking out into the hobby.
There is quite a few ways to keep the humidity up, Devder1. Dart frog tanks need a glass lid which help with the humidity. Planting the tank with live plants also helps along with daily misting. It is very doable. if I can help you out let me know.
I am glad I steped out of this conversation for a few days it was getting no where quick. ( but I was also glad to see a few people actual agree with my opinion). So i will avoid the whole mixing conversation ( pointless anyways) and see if I can answer any other questions that may arise.