So I am setting up a new larger tank 8ft penninsula 300 or so gallon. I didn't want to spend a lot on rock. I made some cement rock with some portland cement and oystershells. Lot of fun really. I have cured the rock in the tank for about 6 months or so. Long story. I am finally about to start putting in some livestock. For some reason I cured the rock with saltwater. Does anyone know if the curing process gives off toxins or if it just causes the ph to spike? Id prefer to put the money into frags as opposed to buying more salt. My parameters have been stable so I threw in a few test critters from my other tank. The 8 blue leg crabs are doing fine but the damsel and snail are MIA after a week. Do I need to dump water and start over?