"Blake" wrote in message ...
I have a 155g tank that I'm getting ready to re-plant. I'm going to be
adding a CO2 system to it and am considering a PH controller. I was
wondering if anyone had any advice as to:

1) Whether this is really necessary
2) Which one is better

Thanks,
Blake

Don't need it and will not help.
Get a pH monitor instead, this is cheaper and has the accurate display
of pH etc.
You adjust the pH by setting the needle valve which will hold a steady
pH in a weel designed system as good as most any pH controller set
ups.

Regards,
Tom Barr