o you can go bad with fluval all right!!! don't buy anything fluval unless its FX5... they have redeemed themselves with it.. but the rest is junk...
and about xp4... not bad mouthing it's reliability.... i heard the flow is horrible from people who have used them... for the xtra $$ they say it's just not worth it and to get xp3.. and last time i checked xp4 was 200 bucks or more... i would cough up 30 more dollars and buy the fx5 with standard free shipping.... this guy wants a smaller filter anyway