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dang. It sounds like the display was meant for freshwater applications and put to use for salt. i agree with the previous post, a canister or hob isn't as luxurious and might require a bit more maintenance but plenty of nice tanks are sump-less.only problem is that the only thing that could really fit in the stand I have now is a basic 10g and 10g for a 55??? almost useless.
yeah that's what I have been thinking about maybe in 5 or so years when I can have a tank in my own house (because i'm only 14) to get around a 120 to even a 180 or 200 cube style. My biggest problem was not planning on going with a sump in the beginning and now that its been a month with the tank running I feel like drilling or adding sump should be out of the picture. So I feel like a hob protein skimmer possibly some stronger lights and a canister filter are the last things I will buy for this tank filtration wise.Another option to try is to drill a small hole (+/- ⅛") in your overflow and return pipes just below the water surface. So at least if/when the tank drains, those small holes will break the siphon closer to the surface negating having so much water flow to the sump. Still would have to periodically check those holes to be sure they don't clog.
As others have stated, a gate valve (not ball valve) is a must to fine tune the flow back to the tank. Without an overflow box, your task can be difficult to achieve. If for some reason you lose your siphon to the sump, your tank will overflow from water being pushed from the sump. There are ways to set up a tank like you have, but it will require always keeping an eye on it. More traditional reef style tanks with overflows (with a herbie, or bean animal setup) are more of a set and forget ( for the most part).
It's a matter of your risk tolerance and time to dedicate to your tank. Maybe keep with a canister/hob with this tank and eventually find a deal on a similar (or larger lol) drilled tank for peace of mind and less stress of flooding. Just some food for thought.
Based on that picture, it isn't ever going to work. Too much water will siphon out of the tank when you turn off the pump and the 'overflow' wont automatically start when you pump water back up.heres the basic sketch

