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I did about 95% DIY rock in my 180 gallon. you are going to want to cure the rock in reg. tab water for about 6 weeks. I wouldn't even bother checking the PH until around week 6 in fact. Change the water our daily, keep a power head in there. After about 6 weeks i checked the PH about every 2-3 days until it stabilized. After about 7 weeks i filled the tubs with salt water and let it sit for another 2-3 days and see if the PH went up ( it did not) So i put it in the tank with the LR i already had. 9 months later my tank is stable, the coraline is spreading over all the DIY rock, and it is pretty hard to tell the difference other then my DIY rock is BIG. If i was to do it again (and i might) i will make smaller rocks.
By the way. I would not use a glass tank to cure them in. when curing they leach a nasty gunk that will cover the glass. you will have the scrub it with vinegar water later if you do that. Get some cheapo rubbermade tanks and cure the DIY rock in it.
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