I would use All purpose gravel similar to below. It's always located in the Concrete section FYI, not the outdoor landscaping section. I actually just had to buy 250lbs of it to bed a sewer line I am replacing.
https://www.lowes.com/pd/Sakrete-60-...Gravel/3066391
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80g Deep Blue Rimless - http://www.reefcentral.com/forums/showthread.php?t=2651295
225g Reef Savvy SPS Dominant - Retired http://www.reefcentral.com/forums/showthread.php?t=1945361
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