I'm going to have to try this out for my reef tank. Over the years, I've spent hundreds of dollars on dosing pumps, and if this works well, it could save me a ton of money
I use Atlas-Scientific i2c enabled dosing pumps and Node-RED on RaspberryPi4 to run 3 channels of dosing on my planted aquariums. the Atlas-Sci stuff is a bit expensive and you could buy entire dosing solutions on Ebay cheaper.... However, I like supporting these guys as they are always developing fun new products. WhiteBox Labs is another provider of interesting solutions for RaspberryPi that I support as well.