Necessary equipment for a reef tank:
Lights (as good of quality as you can afford)
Heater
Something to move the water (PH's sump pump, whatever)
Protein skimmer (don't let anyone tell you otherwise. Do you wash your car by hand with a sponge and bucket or do you take it to the car wash?)
That's it. No canisters, no trickle filters, no bio balls, bla bla bla, everything else is either an advance option (calcium reactors, zeovit, etc) or BS (canisters, crappy florescent lighting, nemo toys, etc).
Hope that helps.
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This and that.
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