I finally figured out what caused my tank problems! It is Alagefix! I stopped using it ever since I started on the weekly syphoning for the 4 weeks that RobD suggested. When is stopped using it nothing bad happened all of my cichlids lived fine! I tried using it today putting the right amount of it from the directions and I have lost some Sal fry in the 20 gal L and some of my new fry in the 55 gal! I am NEVER going to use this again! So everyone beware of this product! It is made by API!!