04-09-2010, 01:47 AM
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I grabbed mine from A.C. Moore, got some small ones for 89 cents, and some medium sized ones for 99, I took one of them and carefully broke it in half, then sanded down all the edges really well with a fine grit sandpaper, rinsed it very well a few times in hot water, let it sit for awhile, and put it in my tank, the hole isn't an issue, since it's in the gravel the way I have it, but as for plugging it up, I'd probably just be lazy and plop some of the aquarium silicone in it, maybe grab a stone around the size of the hole and silicone it even.
But as for cleaning, I just washed it really well with warm/hot water, and kept going until there was nothing but clear water coming off of it.
Seems like it hasn't bothered my fish in the month it's been in there.