This tank started out with a Herbie. Made the fatal error of not realizing that you can't plumb two herbie overflows together in to a single outlet. The instability it created in the return chamber of my sump was wreaking havoc on my ATO, and was generally awful to deal with so I converted to a durso. Still not in love with the idea of a Herbie on a tank with dual overflows because of their potential to mess with the water level in the return chamber and having to tune two of them. The way I understand the BeanAnimal overflow, the water level in your return chamber will be constant so long as there is water coming down the trickle pipe.
Also, I'm thinking that for the bean animal when I need to divert water flow, I'll be able to simply close off the full siphon down pipe and only divert the trickle pipe. The trickle pipe will become a temporary durso.
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