I didn't seal it up because the only thing I had around here was pea gravel. I'll replace the pea gravel w/ cobb or vermiculite, seal it up and it should be good to go
For your practice one, you can just use dirt, just mix it with some water and pack the mud in there. If you have a fireplace or wood stove just use ashes.
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"Government is not the solution to our problem, government is the problem" Ronald Reagan