Tank Cycling

[carsona246]

All fish kept at petstores need to be quarantined, regardless of the species(in my opinion). The petstore will most likely claim they are disease free, but if they have been in a tank with multiple other fish, they are probably carrying something. I honestly have no idea if frogs are susceptible to fish disease's, but I'm not a huge fan of using anything alive to cycle a tank.
Test strips are not very accurate, I recommend getting a drip ammonia, nitrite, and nitrate test kit. They are more accurate, and you really should have an ammonia test kit. You will not be able to tell if the tank is ready for the frogs by watching the fish. You tell if the tank is ready by testing the water and making sure there is no ammonia and nitrite and less than 40 ppm's of nitrate.
There are pro's/con's of keeping your frogs in an uncycled small tank vs keeping them in your larger tank. If neither tank has been cycled then you just need to decide which is easiest for you. If you keep them in the small tank you can do multiple frequent waterchanges to keep ammonia down(once a day in that size tank), and it is easier to do a waterchange in a smaller tank. However, with a larger tank it will take more time to build up ammonia prior to needing a waterchange. You will be doing less frequent waterchanges(every other day or so) but the waterchanges will have to be larger to keep ammonia down. Regardless of which method you take, you will need a test kit to monitor how much ammonia is in either tank.
It can take up to 6 weeks to cycle a tank, so just because your frogs have been in the smaller tank does not mean it is cycled. I suspect the tank you are currently using is not cycled.