Well think I finally figured out why fish in my sons tank have died. The last betta we got a week ago I found wandering around the tank last night. He had small white spots all over him. I immediately removed him from the tank and put him in a bowl by himself. Did a 60% water change slowly adding the water back to the tank not to stress the other fish, also adding salt to the new water. Using the recommended amount. The tank is a 10g tank and it still has a pleco, 2 danios and a guppy. These fish show no signs of ICH at all, kinda hoping it is a isolated deal but not taking chances. I went to the local petstores to get some Aquari-Sol but did not find any but got Jungle Ich Treatment tablets and liquid. Figure I will put half a tablet in tonight do a 30% water change tomorrow and put the other half in tomorrow and change the water again in 5 days. I don't have a tank heater to raise the temp. Seeing here in South Texas it does not get that cold. This all started after I got a fish from Petsmart that died. Ever since than been having issues. Any advice or suggestion would be appreciated. But so far the other 4 fish so no signs, still think I need to treat the tank though