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If all you did was add sand, my bet is on dust from the sand, pretty common when you add sand to a tank and typically little more than a cosmetic issue that should clear up in time.
If you had a Magnum filter you could use a micron cartridge the clear it faster-- pores are small enough to filter out very fine particles. Not personally experienced with them but I've also heard of people using a micron filter sock to do the same thing.
Theoretically, depending on type of sand, it's possible the sand (or dust) is releasing silicates and feeding a bacteria or diatom bloom. Don't think it's that likely, except in a lower ph tank.
Either way, typically just a matter of time to clear out-- or some type of micron filtration will speed the process. When adding sand you can normally reduce the dust issue by rinsing it thoroughly ahead of time (for future reference).
If you had a Magnum filter you could use a micron cartridge the clear it faster-- pores are small enough to filter out very fine particles. Not personally experienced with them but I've also heard of people using a micron filter sock to do the same thing.
Theoretically, depending on type of sand, it's possible the sand (or dust) is releasing silicates and feeding a bacteria or diatom bloom. Don't think it's that likely, except in a lower ph tank.
Either way, typically just a matter of time to clear out-- or some type of micron filtration will speed the process. When adding sand you can normally reduce the dust issue by rinsing it thoroughly ahead of time (for future reference).
