[Tanu]

Indeed it is about 2600 gph. The pump isn't much larger than a Aqua Medic Oceanrunner 6500. It doesn't transfer much heat to the water. It is partially outside the water because the water level in the sump isn't that high. I might have to increase the water level because of the BK, but I'll first try it like this.

The backdrop is almost fully covered, the tank has been running for 2 years now.

The anemone is still in the tank, it is behind the big green Acropora now. When you take a very close look, it is visible in the pic.