I have a 35G sump on a 70G for two reasons only.
1 Unsightly equipment(heaters, powerheads, big skimmers) disappear from the display tank
2. Water volume. By adding the sump I now have more water, ergo, less can go wrong. for example if the water level drops an inch in the sump, the salinity won't skyrocket like it would without that extra water volume.
Some people add things like refugiums (good to have also) and other types of filtering etc, but IMHO Sumps are the kats a$$ for a display tank you want to show your friends.
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"what do you mean you need another tank??"
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