I just put one on my 320 and I was surprised that the outflow is not that terrible as there are two outflows and you can direct them anywhere you want. I put one down and one to the bottom. Definately have atleast a 150 to 180 if you want to use one of these BAD BOYS.
Well I got the FX 5... I was debating the eheim wet dry but just have had bad experiences with eheim and didnt want to chance it and I got to say I love my other fx 5 so Im gonna stick with them.
Its up and running and looking good
FX5 is a good choice, like already said, if you upgrade your tank you won't need to upgrade your filter. I use just a FX5 on my 200 gallon and the water is always crystal clear.