My mind is leaving . I now Understand why some as I have done on one Tank am using a Canister only . I did that only because of its size 40G. Now I see the benefit for Large Tanks forgoing a Sump. There is Zero chance of a water overflow. That said the only benefit to a sump is to add more filtration , water top off / changes , and dosing , and not having any HOB equipment . So which is more important ?

. Thanks