Hello, everyone! I am in need of severe help. Almost all of my fish have died in my tank and I am not sure what to do anymore. I started with 3 Platys, 1 Opaline Gourami, 2 Pearl Gouramis, 3 Boesemani Rainbows, 2 Bristle nose Plecos, 1 Rubber Lip Pleco, 8 Harlequin Rasboras, 8 Cherry Barbs, 12 Neon Tetras, and 10 Emerald Cory Cats. So a total of 50 fish. The fish were added as juveniles in small batches over the course of 6 months. Just for background, I perform weekly 25% water changes and have a gravel substrate that I vacuum with the water changes. I also 3 HOB filters which I thoroughly clean each piece (except my bio-wheels) every other water change. I check my water parameters with the Master API test kit every week before I do water changes which have consistently read 0 for everything and 7.8 pH. I also keep the tank at 76F. About 4 months ago, my tank had an outbreak of a fungal infection (white cotton attached on most fish--not ich). I treated that with Pimafix and aquarium salt for the recommended dose and time period and all was resolved within a week without any casualties. A month later, my cory cats started to look as if they were bleeding from every pore of their body. Extremely bright, blood red. I then treated the tank with Melafix and salt and lost 5 cory cats and oddly 1 Boesemani rainbow fish during the process. The Boesemani was EXTREMELY pale before he died the next morning. So that brings the fish count to 44. The surviving cory cats returned to their natural color and everything seemed well in the tank. As of this last month, I have been mysteriously missing fish. My neons always schooled together in their group of 12 and one day I woke up to only find 8. Same with my rasboras and cherry barbs (I could only find 6 rasboras and 5 cherry barbs). I started thinking my Rainbows were eating them. The Rainbows are only 2 inches and the small, schooling fish are either one inch or less. Each week when I would do water changes, I would find one or 2 fish skeletons which furthered my suspicion that the Rainbows were eating them. Thus, my fish count is now 35 at this point. Every day for one week I would find dead fish with no apparent reason as to why. 2 platys, 4 neons, 2 rasboras, 1 cherry barb all mysteriously would be dead one at a time each morning. Now my fish count is 26. After this episode, my tank got ich. I immediately started treating the tank with salt and progressively raised the temperature up to 86F. I was doing daily water changes and gravel vacuums. This was a week and a half ago. I continued treatment and observed for 5 days and saw more and more fish becoming infected. I then got desperate and started dosing the tank with API's Super Ich treatment. I hate using harsh chemicals on my tank but I did not want anymore fish to die. Today, I poured my second dose of the Ich treatment (with the temperature still at 86F), when I noticed two of my rasboras were floating at the surface, panting with giant, inflated bellies and pineconed scales. I immediately euthanized them as I am certain they had Dropsy. My Rubber lip pleco, rest of the neon tetras, and a Cory cat had all been discovered dead. This brings the fish count to 20. Currently, no other fish seems to have physical symptoms of ich or Dropsy. One rainbow looks to be on its deathbed, however, as it lays on the floor most of the day and is becoming pale. I am not sure what to do... I am desperate and do not want any of my other fish to die. Please help!!!!!!!