A T O question

[hankhill31]

What is a hood ATO FOR a 300 gallon system anyone selling any??

 

[Steve Burton]

Tunze 3155
Here's a good deal on one
Thread 'Tunze 3155 auto top off - $120' https://atlantareefclub.org/boards/index.php?threads/tunze-3155-auto-top-off-120.1188611/

 

[realfish]

I've been using Tunze for years. If you are just topping off the sump, the Nano version works just fine.