Man I haven't heard of tufa rock for years lol. I used it back in the uk around 10 years ago and it did me well but I was just a fowler tank back then. Its more of a sandy rock from what I remember and porous not much help I guess sorry.
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206 gal tunze centre overflow star fire front illumina 260
Loudest part of my system would be the nagging sound I hear on a regular basis about how much time and money I spend on the tank.
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