It is for an IM tank. I was told the 9001 won't fit IM 10 and I know the Tunze 9002 won't fit because I have one and tried it. That doesn't leave much choice but you say the ghost is great? I'm not sure I like the collection cup drain although a lot of people would like it. If you have the cup draining into a container you become lazy and don' pay as much attention to the skimmer performance as you would if you had to dump it every 2 or 3 days. I imagine I could plug the drain. I like to know how much skimmate is produced on a regular basis, it's like a parameter for me. LOL