Why do you need hydroballs for Chubbs tank? What are you doing with them?

As for the little one, it is up to you. Yeah you should not support poor businesses by buying from them..... In theory.... In reality i would probably go home with him lol or at least had a speech to their manager, or i'd do both

But if you end up getting him just to put KK inside your tank is not good, both frogs should not see each other. The other thing to consider - your new one should be under quarantine conditions, fecal done for both frogs if you havent done for chubs yet.