OK, thanks Fishyface. I'm now going to go set my Setpoint at 6.7, wait for the Solenoid to open & start Co2 injecting then see at what pH it shuts off at then I will do an API pH test to see if anything is in agreement. Thanks millions. Hope I can help you sometime, if not hope to talk to you again soon. I'll be posting some pics here as soon as I master that task also :-) I just got the tank planted 2 days ago, want to show the now then later pics. I hope it progresses in the right direction.
Thanks & good nite.
John (miata)