I think that frogs being "difficult" to keep is a myth. We use the word difficult to replace what would be a lot of other words, like; time consuming, expensive, diligence needed, etc. In truth, it sounds like you are very dedicated to your animals, and thats all you really need. As long as you consistently care for the animals, i.e. feeding, changing water, cleaning tanks, etc, they are not at all difficult to keep (even the truly "difficult" like darts". It's really just about the amount of time you're willing to put in. Anyways, it sounds like you have plenty of experience caring for animals, so i'm sure you'll be just fine. Best of luck with the pacman!

Alex