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Yes I am to a degree... I understand that it may be high in phosphates and because of that it was used to make fertilizer. So I suggest soaking some in water a day or two and run a po4 test on it. Otherwise I would say you could use it.No rock making for 5 days? So the pieces are soaking in a 20 gl with a little maxijet. Day 3 now I changed the water yesterday. It was indeed cloudy with scum on the surface. I got some cheapy ph strips from Wally World and will 1st test in a day or 2. certainly not expecting the ph to even so on these test strips. PRS, Are You familiar with coquina sand? It's common here on the east coast it is mostly finely ground ancient sea shell. That might make good filler. Sea shell is mostly calcium isn't it? Thanks.
I am a little confused about what you are asking... so I'll answer what I think you're asking.When doing the Portland mix and some dry rock, do you let the diy rock harden before adding the dry rock to cycle a new tank?
I am a little confused about what you are asking... so I'll answer what I think you're asking.
Once you make your diy rock, you MUST go through the curing process to leach all the excess alkalinity from it. Once this is completely cured you can either cycle it with your tank or if you have another established tank you can add it to that system to make it live and add it to your new tank later. In any case you absolutely have to put it through the cure process before it can be used in any system.
If you are rocking the inside of the tank (what this sounds like to me) I would use that as the curing tank as basically you have no choice in this case. You can add the other diy rock to it for curing at the same time. You cannot fill it with saltwater and try to cycle a tank with uncured diy rock.