I just got a jebao wifi 3.4 doser used. Was really easy to hook up. App was super easy even though alot of people complained on Amazon reviews. So I'm still figuring it out but you can put 24 doses on it each pump and I think it can even do daily intervals, like it can be set to one dosing schedule Monday a different one Tues and so on. Retail is 99$ don't think you can beat that.
I used a Red Sea Reef Doser 4. Amazing pump and super precise. Only issue would be if you're doing large volumes as it's a slower, more precise style pump, not made for large volumes.