well hex tanks have two problems one of them your friend already addressed. The lack of surface area. Most marine fish need high o2 content in their water. Therefore hex tanks aren't ideal for marine aquariums, but doable. The second is lack of territory. In a hex tank there is less surface area for the fish to setup boundries and territories. Other than that, a lightly stocked hex tank can be a very unique and successful one.
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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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