Hello Everyone, So I have had aquariums for about 12 years now. Always stayed tropical and in the last year I setup a goldfish tank. It is a 150 gallon tank, 2 canister filters, water is crystal clear, nitrates 5 ppm, 0 nitrites, 0 ammonia. Tank temp is around 73, since I live in Florida. No heater. We have 9 fish, most we have had for over 6 months, all doing amazingly well. The tank is very friendly, no bullying. I feed them repashy. In summary, well kept tank, great numbers, friendly, cycled, and all fish have thrived except for when I try to add pearl scales. For some reason, when I add pearl scales, from different sources, they seem to only last a week, maybe two. I can ever separate them and this will happen. Anyone here with pearlscale experience that can give me some ideas on what could be happening? Thanks in advance.