I am debating over and over on a controller or something else for the build. My question is, is a controller a necessity or a luxury? I know it displays temp and ph with controllable outlets. But I have radions so no need to control lights, dj switch for pumps etc. No calcium reactor but I will have dosing pumps for 2 part. So is one really necessary or not? Please help me decide and understand. I've never owned one.