Hello, new to the forum here and I am at a loss. I have a 30 gallon tank that is cycled. It has been running for a little over a month and my level are: ph- 8.0 kh- 20 degrees ammonia at 0 nitrites are at 0 and nitrates at about 25ppm. I have currently 5 mollies 5 guppies 2 ghost shrimp 2 snails and 1 pleco. I have had some other fish that unfortunately have not made it including 2 gouramis and 2 loaches. I am at a loss as to why they died. They didn't show any signs of sickness. They stated to become a little lethargic and I treated the tank for bacteria and parasites and it didn't help.I have done research and am at a loss. Not sure if anyone has any ideas that might help. I have recently got a quarantine tank and will be using it if / when I get new fish. My LPS said my ph is to high but I dont really want to mess with it for fear of causing more problems. And im.pretty sure the fish should be able to adjust. Any help will be appreciated.