On my 50 gallon FOWLR I built this auto top off system. It is a 5 gallon water jug from Canadian Tire which I tapped a valve into and a humidifier float mounted in the sump to control the level. I used a scrap piece of glass siliconed into the corner of the sump so I would not have to drill into the sump itself (I was concerned about breaking it). I used a dremel tool to make the hole. I had room enough in the cabinet for the water jug. I built a small shelf for it to sit on as high as I could place it so it just gravity feeds. There is also a vent tube on the jug to allow air in as the water drains.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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