Gravel equals impaction.....equals dead frog....don't be dumb.

Now see? That was worded with a flavor of rudeness. Weather it comes across as rude or not, its 100% true.

You've been given great advice in the spirit of caring for your new friend. Don't screw over your frog for the sake of being stubborn, for lack of a better term.

On top of the impaction risk, you will have a hell of a time cleaning when the frog gets some size to it.

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Thanks
DW