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If you have good established husbandry then the thing a sump can offer is more room. Room to hide the heaters, a skimmer, other filtration like carbon or GFO reactors, dosing equipment, ATO, algae reactor and the likes. Speaking as someone who’s used a HOB overflow from eShopps for 5+ years now don’t be afraid. They’re not reliant on a pump so won’t lose siphon. I run 2 in a chain, 1 overflow from main to frag tank and from frag to sump.