I am running a two chamber sump (one chamber contains the skimmer and the refugium) and the other for return pump with bubble trap. My skimmer is quite sensitive (I dont know why) to the level so I was afraid that it might go crazy even if 1/4" of water level goes down before ATO detects it. Works well and saves space too. Skimmers are becoming compact so no waste of space if I get a compact skimmer in the future.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob 
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