I have a 4 channel medical peristaltic dosing pump that I was going to use for dosing 2-part solution and maybe use the other 2 channels for constant automated water changes before I found a deal on a CA reactor. I would sell it for $100 if you want it. I can get a picture later.
It has 4 different rollers for running 4 things at once. It has a variable speed knob and an on off switch. You could run it on a timer if you wanted (unlike some of the new digital ones that will lose settings if powered off)
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