I ask because I have tap water of 7.8ph, 7dkh and 14dgh. When I mix 2/3 ro water the ph is about 7 and the dkh is 2.5 and the dgh is 3.5. If I use the ro mix, is fluval stratum going to take my ph down to 6 or there about and strip out the dkh and dgh or does it only buffer down to a certain point like 6.5 or something? What I don't want is if I'm starting at a ph of 7 to go down to 6. I'm trying to achieve a ph of about 6.5-6.8. Should I just use tap water and let it buffer down? Does fluval stratum/aquasoil buffer to a rough fixed point or a solid 1 ph drop regardless of you starting point?
Thanks for any input.
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