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I have over a 100# of Tufa rock I would like to use in my Cichlid tanks but have read it's not good to use and also read it's ok to use, lol. I also have Cory cats, syn cats , bristle nose plecos and clown Loaches in the tanks.
Tufa is a form of limestone produced by precipitation out of normal temperature water with an extremely high CaCO3 content. It is typically very porous and readily dissolves if the water becomes slightly acidic. It will harden water just like crushed coral so it isn't ideal for softwater fish. The holes/pits tend to form sharp edges that can scratch fish. Personally, I wouldn't use it for scaleless fish, like your catfish and loaches, which mostly prefer water that is less hard and alkaline.