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Idk if it's sand. The tank was super clear yesterday? It looks like if ur water pump doesnt have enough water it shoots out lil bubbles. That's what it looks like but I have plenty of water in ther?
Micro bubbles can be created many different ways, the most common is from the skimmer.
If you happen to have a sub tank, put sock filters on the tubes that run into your subtank and they will catch all the loss particles floating around in your tank.
Also, sand tends to settle on the rocks so it is best to brush the rocks off once a week to keep them clean.