Myka, I'd get a Profilux controller and a slave doser - get the Profilux with the LAN card so you can monitor things over the net and change dosing/whatever as required remotely.
FWIW, the Profilux pumps have been rock solid for me since April last year. Set and forget. You could probably even set up automatic water changes with enough Profilux pumps. You can certainly do the ATO with the controller and pumps too linking it to float or optical level sensors on the Profilux.
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