Ok, its only a 120g tank and I'm not big on this idea of running overkill nonsense filtration. Plenty of bio media and water changes. I just don't know the specs if the eheim and couldn't find a lot on capacity and flowrate. the tank is in my bedroom, otherwise I'd do a sump. The fx5 would he find and give me the turnover rate, but just looking for some opinions on the eheim. Thanks