How do I raise alkalinity?

[matt]

It'll last indefinitely. The Marine Environment stuff that I used recommended mixing the whole bag at once, something like 40-50 gallons. You can keep that in a clean trash can, covered for several months with no ill effects at all. Once it's mixed and aerated, and adjusted for ph, Ca, Alk, you don't have to keep it moving.

[Richard]

Oops...I didn't spot that this was a 10 gallon tank. Given that it's such a small tank, I wouldn't dose ANYTHING. A 10 gallon is easy to maintain with just water changes. Whatever salt floats your boat will work.

[mharmon]

It'll last indefinitely. The Marine Environment stuff that I used recommended mixing the whole bag at once, something like 40-50 gallons. You can keep that in a clean trash can, covered for several months with no ill effects at all. Once it's mixed and aerated, and adjusted for ph, Ca, Alk, you don't have to keep it moving.

The reason I asked is that I had a gallon left over from the last water change and it sat in the bucket I'd mixed it in for a week. When I reached into the water to test SG, there was this very clear, nearly invisible thick layer of slime on top. It look a lot of rinsing to remove the slime from the bucket. I don't know what that was, but I suspect it was biological. :sick