Freshwater Protein Skimmer?
Hello again! Well, my $20 tank has gotten to be very expensive! I now have yet another question for you to consider. To refresh your memory, I currently have a 35 gallon tank with a total of 17 African cichlids. (All Malawi Rift lake cichlids), 5 giant Danios, 2 Synodontis Eupterus, and 1 Pleco. Overcrowded to say the least! I maintain the temp at 76-78 degrees, and it is filtered with a Whisper PF for 20-40 gallon tanks, and now I have added an Emperor 280. I have also added an 4.5″ cylindrical airstone pumped by a Penn Plax Silent Air for added aeration. My problem is that I have recently noticed an oily, slick film developing on the surface of the water. It doesn’t seem to be harming the fish but it is very unappealing to look at. I have only lost one fish, (a giant danio) and it was because the Cichlids ganged up on him and had him for dinner! I change the water about every two weeks (20 – 25%) depending on the exact time frame and how much waste they make. Despite all my efforts,
