Can I use baking soda to raise pH?

It can raise KH and pH, but it is easy to overdose and can cause dangerous swings. Crushed coral or prepared GH/KH+ water is usually safer.

How fast does crushed coral raise pH?

Slowly, which is exactly the point. It may take several days to a week before the effect becomes stable and measurable.

No. Many Caridina lines need low pH. The risk depends on the species, the line and whether the pH is stable.

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