These are small gold fishes. The biggest was under 3". They've been around for years...all fishes are small. I've been feeding them alternate day so the tank remains clean. If it's a cumulative...
They didn't die in quick succession. Mostly one at a time. Guppies and betta died earlier in the year...the bigger ones started with the silver shark. He started becoming red..like having wounds on...
It's an 80 liter tank I have for around 8+ years now. Water conditioners are added during weekly / biweekly water changes only (25% change) 1. Anti-chlorine 2. Liquid that binds turbidity - blue...
To put things in a different perspective, all my other fishes have died. Including rest of my gold fish. One by one. Not all together. None exhibited this type of color change. Many died from dropsy....
Otherwise healthy looking. But tail tips have turned black. Why is this happening?https://uploads.tapatalk-cdn.com/20201116/52635fcd6d68a0d20ad0ced0012bba9d.jpg