You can watch Kazakistan adventures thread - that will teach you advanced technologies of peristaltic pump marking. The example shown is for Nema 17 motor, if you upside the peri pump to Nema 23 - you can pump up to 1L of effluent a minute! Nema 17 would probably get you up to 200ml/min.
I build my own DIY calcium reactor - twin chamber 7L media. For 100G tank I currently dose 30ml/min, If you have questions about calcium reactor build/experience - give me a shout!