Hey guys, I've been dealing with a weird illness that has me completely stumped. First it was a glowlight tetra. All of a sudden, overnight from what I remember, I noticed he couldn't swim properly. At first I thought it was swim bladder, but after a day in a hospital tank, he lost his colour and his eyes started bulging outwards. He wasn't able to swim much at all, so I had to euthanise. It was horrible. I figured it was a one-off because a couple of months later everything was fine. But I noticed my Scissortail Rasbora with the exact same symptoms. The other fish were picking on him which I thought was odd, but obviously they knew he was sick. I moved him to the hospital tank and I'm now at work wondering what to do. Any help would be appreciated! His symptoms: loss of colour, bulging eyes and can't swim properly. I'm on my phone so I can't copy and paste the diagnostic questions, but the tank is fully cycled, it's a 3 foot tank, around 130 litres. No ammonia or nitrite, nitrate is around 5-10ppm. Did a water change only two days ago. The rest of the fish seem totally fine, but I'll keep and eye on them.