Hi Everyone, So I just took my tank parameters: Ammonia: 0.0 (possibly a little above, color was between 0.25 and 0.0) Ph: 8.3 Nitrate: 40.0 Nitrite: 0.0 Temp: 83F I have a 46 gallon tank with: 5 mollies 1 swordtail 3 Platies 6 kuhli 2 Algae eaters 1 ghost shrimp 1 mosquito fish There is an aerator and six plants. One of my mollies started shimmying about a week ago and since then I’ve noticed others begin to do so, not as much but enough that I noticed. At first I thought it was low ph at 7.4, but no other fish did it so I carried on and didn’t change anything. I lost three fish (2 platies, 1 swordtail) at the end of March to some disease that made them extremely emmaciated and caused them to hide. No other fish seem sick or look thin. All look fairly well. I have treated with paraguard but haven’t done water changes in a bit so haven’t added anymore. Aside from the shimmying the only other thing I noticed was my black Molly hiding when I got home today. She keeps getting reoccurring bouts of what I believe to be is fungus but recovers quickly. Since she is the fish most likely to get sick, what do you think is going on? She is not shimmying severely. Is this a disease or something in the water? Should I treat with paraguard?