I inherited a Whisper 30-60 power filter from a relative so I don't have the manual or directions. It has a nob with settings from "lo" to "hi". I can't find much on what this actually means but if I had to take a guess I figure it's the turn over rate of the water. I also figured the bigger the tank the higher the setting but that's really just a guess. The tank I have it on is a 50 gallon has a stock of 3 young (about 2" each) CA cichlids who were introduced yesterday and since then I've noticed the water has gotten slightly cloudier. I currently have the filter set to what would be a medium-high place on the dial. Does this seem ok? Or should I up it all the way to the high setting? Finally, if it's running on a high setting does that mean I need to change the filter bags more frequently? Thanks!