Whoah... I've seen this discussed elsewhere... and I haven't heard of a single frog surviving cycling...
"I would use fishless cycling so that the fish don't need to suffer.
Add 5 drops of ammonia (pure ammonia; the kind that doesn't fizz and bubble when you shake it) every day (this should be equal to 5ppm of ammonia in that size tank) until you see nitrites spike. You should test your water parameters (ammonia & nitrite) every day until you see nitrites spike. Once they have, reduce the amount of ammonia added each day to 3 drops. Test ammonia, nitrite, and nitrate every day. You should see ammonia and nitrite gradually decreasing, and nitrate increasing. Once you have no ammonia and nitrite levels in your tank, and your nitrate levels measure 40ppm or less, the tank is fully cycled. Do a 50% water change to reduce the amount of nitrates, and then you can add fish. smile.gif
Edit: This cycling process should take around 2 weeks (it's generally faster than cycling with fish). You can speed it up by adding gravel or a filter from an established tank.
The problem with cycling with only one fish is that the bacteria establishes itself for that small bioload, and when you want to add more fish, the tank can go into a mini-cycle as it tries to adjust to the heavier bioload."
Cutechic -
http://www.fishboard.net/index.php?showtopic=1822