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but kari was thinking today that ross used tufa and had problems...
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I hate to speak for someone else, but since I am fairly close to Ross' problems, I will state here and now that Ross did not use Tufa Rock. Ross uses rocks he made himself following a recipe readily available online. As to using unnatural rock, I think Alan is a bit unfair. I have some Calcium Carbonate rock in my tanks. I have never yet encountered any problems. In reality, I got a couple of the pieces from Alan, and you cannot tell it from storebought LR now.
