Top 5 mandatory reef equipment

[Fizzy54]

Hey everyone what would be your Top 5 mandatory reef equipment to have a flourishing reef tank?

 

[Danroo]

The tank, the stand any kind of filtration, heater and a thermostat.

 

[shakacuz]

test kits, ATO, lights, pump(wave makers), patience…

 

[fish farmer]

lighting, flow generator of some kind, heater, thermostat, ATO.

 

[blaxsun]

Excluding the obvious (and not necessarily in any order): Wavemaker(s), protein skimmer, UV sterilizer, reactor(s) and some type of control/monitoring setup.