It sounds great!Did you find the firebelly toad care instructions in the care article area? It is a great guide.
You'll need some amphibian/reptile calcium with vitaminD3 powder and some reptile multivitamin powder. Use a baggy and sprinkle a pinch of calcium on your crickets every other day and the mvi one day a week, not on the same day as the calcium. Put the pinch in the baggy and give it a gentle shake to lightly coat the bugs.
Isn't that the truth, lol! Setting up can be pricey. It sounds like you've got the set-up down. I find that people who have owned fish are a step ahead.
I'm sure you have dechlorinator, as you have fish.
It's good to have a nice plant or rock in the water area for taking a rest when they swim.