Hey I run a EMP 400 on my tank - love the filter Hate the noise - I was thinkn of getting an AC 110 to replace it - question is how loud do the Ac 110's run ? I know its a HOB so its not 100% silent but compared to the Emp how is it ? anybody have both or have had both at some time to remember a comparison of the noise they make - the AC would be nice for the extra 100 GPH alone but less noise would have me sold