I use pool filter sand. Has never been sucked up by my filter, even if I stir it up. It's easy to clean, just hold the siphon a little bit above the sand.
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Ya when I put sand in my tanks originally no one told me pool filter sand and now I have around 300 lbs of play sand in my basement lol. I'm gonna have to get some pool filter sand when I see it. I've just never seen it anywhere
-Andrew