blange3 said:10 weeks in and you're blaming the sand already! :
Bacteria blooms happen. It's a very young tank still and you have a decent amount of livestock.
If the pareameters are OK and other than the snails the livestock is OK, I would do some water changes and wait it out.
You'll probably get some diatoms soon, and then some cyano, and then a beautiful stable ecosystem. ;D
I went through the blooms already, the diatoms too . . . but everything looks good. Anyways, I siphoned out the sand today and man it stinks!
anyways, here's the pics: