I have an ehiem ecco (2334 I think) and a rena xp4, I've had both of them on my 47g column reef tank ( at different times of course) I like them both, but I think I like the xp4 a little better because it is a little more user friendly. The ehiem seems to be a little better made though. The xp4 can use any type of media you can fit in the basket for the most part, where the ecco you probably would stick with the type of media that comes with it (stony pebbles bio media) where the xp4 I run filter floss, sponges, live rock rubble and some bio media.