Indeed you don't need them... but it all depends on their system and what they want to do with it. Basically he gave some advise of things they SHOULD get. Skimmers, high intensity lights, sumps all help keep a tank trucking along. You don't need four wheels to drive, but it sure helps.
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210 Gal Reef w/ 55 Gallon Sump/Fuge, 125 Gal Fish Only, 65 Gal Seahorse-29 Gallon Sump, 55 Gal FOWLR, 54 Gal Corner FW Community, 20 Gal Nano FOWLR, 55 Gal Piranha, 29 gallon QT
"All the yellow tangs and clownfish in the world can't save you now! hahahah" Peter from Family Guy
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