Hi TB19
Regulating the PH to suit your fish can be a tricky endeavor. Using chemicals to lower or raise the PH levels can shock and stress your fish to death. No matter what method you use to lower your Ph, it will at times fluctuate.
In my opinion you would probably have more success by planning your fish stock by your water readings.
If the blue rams you are talking about are dwarf rams they require consistent readings and the cleanest of waters. They are very sensitive to keep as I can attest to along with a lot of other folks here.
I am sure there are natural ways of lowering your Ph levels and others here can give you much more information on that than I can, since I have decided the best method of fish keeping for me is to buy fish that are suitable for my water conditions. There are a lot of fish that I would love to keep but cannot due to the PH level. I also have lost a lot of fish by trying to keep them in unsuitable PH levels tho there are some that can be more hardy to the difference. Dwarf rams.. Discus... cardinal fish are a few that come to mind that cannot. But no matter what the Ph level is.. the worst thing to do to your fish is end up with unstable PH readings.

~ kate