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Thanks to the post from Chris I was able to do this. Truly hope it works.
The doser plastic connectors were clogged besides tubing. I replaced tubing and used a pin to clear the connectors.
My 2st T was to small because ATO has a larger tube.
Found these grey ones and again to small but...
Still having low ALK issues.
I picked up Salifert Alk kit and it tested at 7; Hanna tested at 7.1.
Past few days adding Reef Builder at very low dose.
The AFR rising tube crystallized at the tube end; I have to clear it daily.
I am using the tube that came with doser.
How do I prevent this build...