Okay so Xmas is around the corner and Ive been wanting to get a couple filters for my 55g and my 150g, but then I just had a lightbulb turn on lol. I was wondering if 1 Fx5 would be okay running on my 150g with my emp 400, so I can take my eheim 2217 out of my 150g and put it on my 55g with an emp 400. Would this be okay? Or would you recommend a different filter?