I've been out of the hobby for quite some time, and I'm just getting back into it.
I've tried doing a DIY CO2 system, and I've got 2 2Ls running on my 54G bowfront corner tank.
However I just decided to put my pollen style bubble counter on the line, and I tried putting water into it with no luck.
How exactly am I supposed to do this?
I feel like this should be obvious, but it's not, and there were no instructions with the package.
this is the one I bought.