Personally I'd step it up to the 9005, that's what I have on my 40 breeder. But if you're getting the 9005, you may as well get the 9010, I wish I did. I like the 9005, but I think the short cup impacts the performance a bit. I find it works better if I don't let the cup have more than 100 ml of skimmate in it, even if I clean the neck regularly.