I am down to only 4 fish, from about 11. They have been dying and I am up to the point of going crazy. I have checked my water twice with my local aquarium, went to two different ones and my water is fine. The puffer I had, had a really bad ich break out so I turned up the temp in my tank to about 89 which then I was told it was too hot, that can be the reason why they are dying. After I changed the temp I noticed they have came out to swim more often but one of my damsels just died he was healthy this morning he was eating fine. I don't have a hospital tank that I can quarantine the ones that are left. I am using Microbe-lift Herbtana 100%natural expel leant for parasitic diseases since Sunday, hopefully it works. Is it possible for ich to live on my rock? Also, please give any suggestions u have that can help me revamp my tank btw I have only had it for about 1 month and a half my aunt had it for 5 years before that and the four fishes she had have lasted till now she had 1 clown and 3 damsels. The clown and 1 damsel has died but the other two are still alive. She never checked her ammonia, nitrates, nitrites, only her salt level.