maseyferguson05;1086797; said:Yes 900 gph with no media and 0 head height.
Check the hoses and see if there is any kinks or bends. How long are they? What is the distance between the top of the Fluval and the output?
Just set my fx5 up on a 215 gal that is over 60" tall, that's approx. an 8'+ hd run & the output flow is steady, about 2x's that of my 405 (same hd run distance) except coming from 2 outputs. Have seen an fx5 set up w/ about 60" hd run total (2' stand, 2'H tank) & the flow is tremendous, extra 4' hd run or lack of is a huge difference. Make sure as the video & instructions indicate that there is no slack at all on the hose runs, that's about 11 min's. into the DVD, also at the very end (13 min. or so) when they show the start up sequence, you can see that the outflow via the bubbles blowing from the filter on a tank & stand that size (indicating a longer hd run) isn't really just blazin, blowin & goin, but that doesn't mean it's not functioning correctly i.e. at correct gph filtered. If you're depending heavily on a specific flow desired from your filter alone, you could elevate the filter, decreasing the hd run & increasing the output flow, but your probly not going to gain so much that it's worth all that. Last thing, I just moved a Fluval 405 can. from a max hd run of 4' to 2x's that & lost 1/2 the flow I had, had me scatchin for about 2 sec. till I did the math & applied my antibiotic, ha, ha. Do the math, as maseyferguson05 suggested, then just have faith & if not then just take it bck since it's brand new & if there's any difference w/ the new 1 then there you go.
Oh & congratulations on the new fx5,
cheers mate
Anyone still reading
this who cares, chk this out: (http://www.discusforums.com/forum/viewtopic.php?t=7080&highlight=fx5) possibly the best such type review ever!