I'll give you my personal experience with both these fish and a very similar situation. I've had my Bolivian ram for almost 5 years now, way before I started high tech planted tanks. My ph was at 7.5 and would drop to 6.4 with my co2 around 45ppm the Bolivian ram has been great and healthy, I have had it like that for over a year now and he's doing great. I recently purchased 4 German blue rams thinking if the Bolivian has done so well the Germans should be good too. I was "dead" wrong. Within a week they all died. I have 8 discus, 1 Bolivian, 3 angels, about 40 neon tetras, 4 Cory cats, 3 tiger loaches and about 30 other small schooling fish. Not one death in over a year except for the German blue rams. Of course I did my research after they all died and I read that they do not do well at all in high ph and also need a very steady ph. I can't say for sure that that was it but I'll never take that chance again with them.
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