i did the mods to mine and it works alot better than it did, mine hangs on the back and i think that tube takes away so much to make it a good skimmer. if its in a sump they work great, friend of mine got one the same time i did and put his in a sump and his pulls out 3-4 times what mine does. on my other tank i went with Coralife Super Skimmer so we'll see how that does.