I am planing to acquire some crs and crb. I am wanting to raaise the ph of the tank to about 6.4 - 6.7 to get optimal conditions for the crystal shrimp. The tank is currently at a 6 possibly lower ph I can only see so much with an API test kit I have ada Amazonia soil which buffers the ph Down, how would I maintain a stable ph of 6.4 - 6.7 along with keeping a low ph. Also I have fire red cherrys stocked so any changes would have to be as steady and subtle as possible. I was also thinking of weaking the buffer but idk how to go about that with shrimp inside idk what to do at this point.