I have a new 55 gallon tank in which I have has up and running for one month, I had 16 cichlids in it and added four new ones that all died as well as made my water cloudy. I did a water changes bought a new aquaclear 70 filter. All of my original fish are swimming along fine. My question is did the new fish overcrowd my tank causing it to cloud. I want my tank back crystal clear, will this new filter do the job? How long will it take for my water to clear up? Thanks for your help .