04-19-2008, 09:39 AM
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The Emperor is a very good filter. I had it when I got my 30G tank, and it worked very well. But, do to noise (something got messed up, and it is in my bedroom), I had to switch it to a Penguin 150. But, I love the penguin. As Herefishy said, the Biowheel helps a lot.
But, I do also like the Aquaclear. I wouldn't go anything smaller than an AC70 on your tank though. I have been FW testing my AC110 (the biggest) for a few days now, and it works very well. The noise is all right; I read that you can change the impeller if it gets too loud, but you might not have to worry about the noise.
Overall, for FW, I would reccomend the Emperor.