Hey Grumpy, Thanks! I know you were hoping but I am curious on how you think that helps?I don't have that tank, but this is what Planet Aquariums says about that: "the 62G Lagoon features 2 separate return pump chambers and 2 return pumps for improved circulation & filtration. One chamber WILL drain faster than the other. Be sure to put your ATO on the faster-draining chamber, or keep the water level at least 1/2" above both return pump baffles."
Hope this helps.
If you read my post, you'll see I wrote the words "...within days of putting my ato sensor on the faster side, it switches sides." and "the side that drains faster switches.." Of course you read that and still decided to reply to a question I asked the OP, on a Tank you have no experience with, with an answer you copied from Google?...wow if you aren't on the Reef Squad or getting paid for this kind of support, you really should be! So please, tell me how you think your reply to my question, was helpful?