I just have to pipe in.....I set up the 500S LED a few months ago. I found the C-Skim a total waste of time and energy. It s also prohibitively loud. I replaced it with the Vertex 180i which is incredible.
The pump on the skimmers for the 130C are producing excessive heat. Confirmed this with RS. Either contact them to get a replacement or get a Tunze 9001, which I did.
Just to make sure, turn off the skimmer for a day or two and you should see the temp go down dramatically.
Sidney