Join Date: Mar 2004
Location: Long Island, NY
It's all about surface area! use what came w/ the filter (except for the carbon pad - it'll suck up nutrients). I just re-tasked and eheim 2213 that i had on a goldfish tank a few years ago. bought a box of ehfimech, a box of ehfisubstrat and coarse and fine filter pads. i set it up like so:
approx 2 inches ehfimech on the bottom (more than eheim suggests, but i needed this extra to fill up the canister completely).
next, a coarse filter pad (more to separate the different media than anything else)
next, use the WHOLE box of ehfisubstrat (after you rinse it thoroughly to remove all the sand-like particles)
finish it off w/ the fine filterpad - protects the impeller
obviously this is for a 2213, other filters'll need differing amounts of media.
i wouldn't use the carbon pad or other type of carbon to polish the water, unless you have pretty hard water and you need soft water in your tank. that carbon'll suck out all the nutrients out of the water column in no time, and then be used up (so you'll have to replace it).