I like the Tunze. It's quiet and the controller is simple to use. I have not hooked it up to the Apex and now I don't see a real reason to. I tried the Nero too briefly and returned it. In hindsight, I think if the magnet issue was resolved, I would go with the Nero because of its smaller size.
Did the Nero 5 ever actually come loose from the glass on your Reefer 250? I have the same tank and never had an issue.
