Bad good and best.

[Soccerfish]

Hi everyone. I am new here posting wise but have poked around for awhile on and off. Mostly i am here to get opinions on things as i want my own fish store ( actually fish and reptile shop.) i have many years in the business, but i know there is a broader assortment of heaters, filters, air pumps etc. then I work with. so I want everyones advice/opinions. What is your pick for bad good and best you can pick filters/food/heaters/aquariums/lights/brands/whatever you can list more then one per category (mulitable heaters in bad or whatever) and as many categories as you want.) Any explanations are welcome as well as if you wanna separate pro (something an fish person would want.) vs. common ( average person who owns a tank) thanks! (and i hope I'm not breaking any rules, i looked through them but im using my phone and its more difficult.)