Tricolors aka phantasmal are great frogs!
Granted they are not a screaming orange or yellow color, but they are a very nice frog. What they lack in coloration, they make up for in personality.
We have a group of Santa Isabel and the males call all of the time, they are first to wake up in the morning, and they are the last to go to sleep at night. If you have the opportunity to get these, I don't think you will be disappointed!
As for cycling the vivarium, some people do, some do not. It is not really neccessary like it is with an aquarium.