My 75 gallon
My 10 gallon.
Okay, so, I just put these into the tank (no co2 running yet, but I figured I might as well get these things in there now, just because). What I did was I added some amount of 4dk solution and about 4 drops of pH indicator from a test kit I had lying around. I used the pH indicator meant for 6-7.6, or something like that, not the high pH indicator that is for things above 8.
The test kit is at least a year or two old, so idk if that's a problem or whatnot. Did I set these up correctly? I know they are supposed to be blue but these seem really really REALLY dark. Should I get a newer pH indicator? Thanks for the help.