Cam, I wouldn't be surprised if the decomposing bodies of your missing rams have caused the spike in parameters
Other than that if the tank has been set up for awhile you should have no ammonia or nitrites.
The spike could be dead fish or maybe you are over feeding?
I am guessing you know all about the nitrogen cycle,ammonia to nitrite,nitrite broken down to nitrates
nitrates are removed by water changes or if your tank is planted thats a good way of getting rid of nitrates as the plants feed on this
As for lowering the ph, if you have a low tds then you can successfully lower it,but if its high it tends to just bounce straight back
So if soft water is what you are after , best bet is something like rain water or reverse osmosis water or if the tank is planted you could run some diy CO2
which will lower it as the CO2 lowers ph. Whatever you do consistency is the key,you don't want to be bouncing the ph all over the show.
Thats why with "most" tank bred fish it is generally recommended to use aged tap water as that is all that is needing unless breeding for example.