has anyone used a protein skimmer on a fw tank? i have a 55g with a whisper ex 70. gonna put mbuna cichlids in it and going to do the over stock to cut down on aggression route. i know my little filter is not going to cut it, so was wondering if getting another whisper ex 70 would be the way to go or if getting a protien skimmer would work better. was thinking of a bakpak or similar skimmer any suggestions would be great.