I used to have river pebbles and then I switched to sand, back when I housed them in a 20 gallon.. here's how I did it.
I rinsed the sand in a bucket, I removed the frogs and put them in a temporary tank. I emptied the tank and added the sand then filled it back up again but the water was still very cloudy, I let the filters run over night and added back my driftwood, plants ect and then added back in the frogs the next day and they back to their froggy business.
ACF are rather hardy animals and tolerate human use pretty well, swapping out substrate shouldn't be a huge issue. I just moved to a new town with my frogs and while they certainly didn't go willingly into the critter keeper they were troopers and are doing well in their new home.
If you are going to feed them sinking pellets then I would highly recommend sand or a bare bottom tank though I am the paranoid type myself..





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