The 5000 is a really big skimmer for that water volume. Just my two cents but im thinking you will have trouble keeping a steady foam hight without adding a crazy bioload. They are great shimmers im running a xp5000 cone ext on 500gals.

I have to agree with raven. The 5000 will be almost too much for your sump. My friend has the 5000 on his 250g and is running a 110g sump and he even says it's a little overkill with his setup.

I did question if it was going to be too much and was assured it would be ok. I've got it running and while I know it's breaking in it seems ok. I wanted the 3000 and probably should have searched a bit harder. Guess I just have to see how it goes. It's already pulling stuff out but I can see it needs adjusting.

Can you run it external? else you will have to do it again if you want to clean the skimmer body :-)

I'm probably going to get the 3000. I thought about the maintenance afterwards and this is going to be an issue. On the plus side, I really like this skimmer - the water in the cup is nasty looking and it's picking up loads of crap already. The foam level is fine! If it wasnt for the diameter of the base, id keep it! Lesson learned, when sick and head is pounding, don't make major purchase decisions. Have to say however the customer service I'm receiving has been stellar!

I'm no expert but my skimmer is oversized for my tank too and the foam is inconsistent because of it. It doesn't bother me because eventually after its properly tuned it it will spill over and then the foam dies down a bit. Once the foam has enough organics in it it will build up again and spill over again. I just get spurts of spillage. Instead of emptying the cup daily I'm able to do it every 5-7 days.