Hello guys! We normally get our fish from our local fish store in town. However a week ago I picked up fish from another town I work in. I picked up around 4 fish, one died next day I just figured maybe it might be because of the stress. 2 days ago another fish died in the evening. In the morning another fish died, and by the evening another had died. All four that died were the new fish that I got. When the third died I noticed white fuzzy resin around the black area near its head and gills I googled and confirmed I have Ich. I quickly got Ich X from my local fish store and followed other directions (increase temp, lower salinity, currently at 30 ppt). After adding Ich X all fish seem to have the white spots, two fish were very weak last night and I added some more 1/2 dose of the Ich X and now they seem to be swimming however I still see the white spots on my fox faces and the angel etc. This is my first tank so need suggestions on what to do and what to expect in the future since my main tank is now contaminated. Is it better to maybe just release all the fish and clean tank and start all over again? If the fish heal can I replace the tank water completely and put them back in the new water with same parameters or will the new water also get contaminated any and all suggestions and advice is appreciated please!!! I attached the fish pics below. Thank you guys.