PPM to low?

[sasikan]

i have been doing water changes with R/O water
on my electric blue ram tanks. my readings on my 2
40g are 58ppm and 63ppm my readings on my 10g tanks
are all in the lower 30ppm and one is at 27ppm(i must be changing a higher %
of water on the smaller tanks) Am i going to low with the R/O water?
can this be dangerous for the rams?

 

[coralbandit]

I am not sure what is dangerous , but I try to keep mine between 70-100.
Usually 80-90 . Small tanks can move quick. I am lucky my mix is easy with quart containers.