Undersand cleaners and sandsifters: gobies, fighting conch (1 large per 50 gallons) nassarius snails. [My own solution in this department is a 4.5" golden dascyllus who loves to move sand with her tail. A lot of it. She keeps her cave swept.] For tanks under 50 gallons, the yellow watchman is the strongest sand-sifter you want: the diamond or dragon is for a much bigger tank. [I do NOT recommend goby-shrimp pairs: I lost several fish including the goby to a tiger pistol, the recommended pairing. You takes your chances, in other words. I had to unbuild a reef to remove the assassin.]
a good scraper that won't pick up sand and scar your glass. Tunze Care Magnet is good, but not infallible: use caution, stop if you see trapped sand.
cut a strip of black construction paper as deep as your sandbed and temporarily tape it where it's exposed to sunlight, if that's your problem. Leave it a few days. Then remove. Apply as needed.
a good scraper that won't pick up sand and scar your glass. Tunze Care Magnet is good, but not infallible: use caution, stop if you see trapped sand.
cut a strip of black construction paper as deep as your sandbed and temporarily tape it where it's exposed to sunlight, if that's your problem. Leave it a few days. Then remove. Apply as needed.