Hello everyone and thanks for taking the time to assist me. I've had my 220 litre tank for about 6 weeks. I have 2 gorami's, 10 neon tetras and 6 angels in the tank.The temp is always around 25.5 - 26 degrees. I've done a 20% water change each Friday since establishing the tank. Last weekend I did a filter clean as well. I feed every second to third day with pellets. One of my angels has what I believe is very bad fin rot. How shall I treat this poor guy? Are the others at risk of catching it? Thanks again.