Since removing my ATO to put onto my larger tank I have to daily dump water into the 34g and I find it to be a pain in the rear. Not to mention those salinity fluctuations can't be good. I'd highly recommend one.
An easy way to do water changes is to have another tank plumbed in parallel with the system that you can take offline, drain, refill with your new water and bring back online. Changes of any size are a breeze this way and the system can still run and your sump levels don't change (can leave ATO running without fear of it adding a bunch when you drain water)
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