Alkaline Fish Tank. This doesn’t necessarily mean that you’re doomed if the alkalinity drops below these levels. Some aquarists consider 7dkh and some support 8dkh as the least level of alkalinity.

Tank decor and substrate can. Place a fan so that it blows a breeze over the water surface. Because of the mineral content in most hard water sources, chances are your hard water will also have high alkalinity (more basic).