Southdown sand where to buy?

[Rob]

Try chicken grit or crushed oyster shells this stuff works wonders.
Not sure if you guys have chicken farms in BC....I assume you do.

The chicken grit is made of shell rock....prehistoric lime stone.....98% calcium carbonate........this stuff is so high in calcium that the tank walls turn white in sections.
This stuff is not fine like sugar but same as aragonite particles. It is gray in color...this would be the only downside....but it really isn't that bad.

The crushed oyster shells are even higher in calcium content.......this stuff is flat but somewhat larger in size....shiny like the inside of a shucked oyster shell at the restaurant.

Bonus is this stuff prevents the onslaught of hair algae and it is very cheap.....8$ for 50 pounds.

I live in Ottawa where we have lots of chicken farms.

Cheers and good luck.