I'm not sure of the actual model. Its one that sits cross ways in the 30g sump. I have a big Euro-reef that I have on the other tank that will be big enough for the larger tank when I combine them. One of the reasons I have not upgraded the Tunze. Also space would be an issue. If I run across a good deal on a used one, though, I might consider changing out the skimmer too. I'm trying not to buy anything that I can't use when I move these two tanks into the larger one.

Stephen