I have a 55 gallon marine setup with a Seaclone100 Protien Skimmer, 55 lbs of live rock, three damsels and a clownfish. I want to try doing a reef tank with corals and polyps. I am running two Whisper 60's as filtration. My ammonia and nitrite levels are at 0 and my nitrate level is at 5. everything has been steady for a week or so. MY QUESTION is are the whisper 60's appropriate filtration for this kind of setup? My LFS told me that the whisper 60s are really setup for freshwater and they are insufficient for marine. Can anyone give me the same or different advice??? THANKS!!!