If you have ick in your tank with angels or discus just crank up the temp to about 90 for two weeks. Make sure to add a cup of salt per 100 gallons of water. After a week do a 50 percent water change and ad more salt at the same rate. After week two, do another 50% water change and start to bring the temp back down. After another week do another 50% water change and your fish should be better!