I would shy away from using colored sand... anything artificially colored runs the risk of leeching chemicals or dyes into the water. If it says it's safe I suppose you could, but I personally wouldn't risk it.
For anyone who is looking for a brighter sand. I have been using the crayola coloured sand for a few months now with no problems. It's aquarium safe and looks awesome. I switched after a bad batch of playsand. It's much finer than regular play sand too, and you can even see the axie footprints in it!
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