The most important part of the ATO is I call it the leveler. Suction cup MUST be glued to sump.

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[URL=https://mail.3reef.com/gallery/photos/the-most-important-part-of-the-ato-is-i-call-it-the-leveler-suction-cup-must-be-glued-to-sump.12183/][IMG]https://mail.3reef.com/data/photos/l/12/12183-1276548904-5d977008c81f26812aba95e1f2bf8476.jpg[/IMG][/URL] [URL=https://mail.3reef.com/gallery/photos/the-most-important-part-of-the-ato-is-i-call-it-the-leveler-suction-cup-must-be-glued-to-sump.12183/]The most important part of the ATO is I call it the leveler. Suction cup MUST be glued to sump.[/URL] by [URL=https://mail.3reef.com/gallery/authors/marlinman.16977/]marlinman[/URL] on 3reef Aquarium Forums