imo sand stays a little cleaner, I have used both, currently use both actually, and the sand tank looks nicer. There's some benefits of having a deep sand bed as well. Crushed coral will have its purpose, it does grow copepods like crazy which is good fish food, but overall if I had to pick one I would go with sand. Great topic, looking forward to the other replies.
If you are doing a reef that you want to have gobies, jawfish, stars, or other animals like these a sand bed is needed (depth based on animal needs). However, if you are doing a FOWLR tank, crushed coral does have a nice clean look while adding a texture to the bottom of the tank.
i prefer the look of the sand personally but a number of reef keepers say the sand tends to blow around alot. in all my old aquariums i tended to stick to the crushed coral gravel but in my latests system i used the live sand. i used this because i wanted to speed up the maturity process. in the end in made no difference because i put in a good 25kg of live rock. so all it really goes down to in the end is personal preference
Sand, Crushed coral just has a tendancy to trap alot more waste and the build up over time could explode into very high nitrates.....
Yo can use YardRight/OldCastle Tropical Play Sand. check your local feed stores they carry south down carribean or tropical around here penn state seed has it for 5.99 25lb bag. Then top it off with a little live sand from a freinds tank.
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