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i'm getting a 40 gallon tank for free from a family friend that had bad luck with aqariums. it comes with the lid and undergravel filter which i won't use.
i'm wondering what type of filter i should put in it?
would those big cannister filter be ok?
i've never set up any tanks bigger than 29 gallon before.
help me!

You could go with a hanging filter or a cannister filter. Make sure you filter at minimum 200 to 240 gph. 400 would be really good.

-Eric
"He is no fool who gives what he cannot keep to gain what he cannot lose."

hey tnx for the reply. i saw this fluval cannister 400 something for 59$, theres a 200 one, i don't really know whats the difference=P, exept one is smaller than the other

The 200 one is probably a little small for your aquarium. I was lookings it up and I found a Fluval 104, 204, 304, and 404. They measure theirs in liters per hour, in which case you would want 780 to 910 liters per hour--1,510 liters per hour would be great. So anywhere in that range should give you plenty of filtration. The 304 was rated at 1,000 liters/hour and the 404 was 1,300 liters/hour. Hope this helps.

At minimum, you want to filter 5 to 6 times your tank volume per hour. 10 times is even better.

-Eric
"He is no fool who gives what he cannot keep to gain what he cannot lose."