I have a couple JBJ & one Tunze. Everytime I fill my ATO tank the friggin Tunze ATO will over fill my sump on my 60 gal cube. I have the hose going up 2' then back down to the sump & it still over fills. I have never had a single issue with the JBJ ATO in 3 yrs. so with that said as soon as my new set up is complete the Tunze will be going up for sale or sooner if I get ****ed enough to switch it out for my other JBJ.
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