Sump: over/under/over? or the other way?

[MikeInToronto]

I got the baffles installed and I put the sump back in place, ready to fill it next morning when the silicone was cured. I also rerouted one of my drains so they all dump into the skimmer compartment. Everything was fine and I was heading to bed. I looked in the tank and the anemone looked shriveled but I figured it was "changing water" so I left it.
I woke up and took another look. The anemone was a little larger but still unhappy. I felt the water: cold. "How can this be? I placed the heater in the DT!" Well putting it in is fine. Plugging it in is usually helpful.
Anyway, I threw the heaters in the sump, emptied the stored water into the sump, threw on the return pump and hoped.

Everything was fine. The temperature had dropped to somewhere around 65 so I guess it wasn't too bad. It took a couple hours for it to reach above 70 and I could see the anemone changing as it got warmer. It's doing great again.

As for the bubble trap, it works well enough. There are still micro-bubbles and it seems these are still there even when nothing is running but the VorTech in the tank. I can't figure out where they come from but it doesn't matter. They don't really bug me and there aren't many. One day I may find the cause.