just recieved the skimmer. Tested out the ocean runner 6500 pump that come with it and seems to working fine. The only problem is it's alot bigger than i expected and wont fit in the sump cubord, so i'll have to do a bit of chopping and rearranging. hope it all works. It's got a 3.5 inch diamiter riser tube which i have allways thought is a good sign in a skimmer is this true.