Newest update
the fish still in my 10g, i think both of his eyes are healed, but the red spot in his body havent healed yet. Probably need to put him in the pond asap since he got too big for the 10g.
Well, ok then
Still, giving water parameter would definitely help addressing the problem instead of just straight up moving them back to the 6g, just saying
I'm surprised nobody asked about the water parameter yet.
Instead of putting them back to your 6g, it's better to find out what the actual problem is. Or maybe you should re home some of them, I'm pretty sure some LFS will gladly take them.
Mine probably keeping a school of cardinal tetra alive and healthy for 7 months and still going. I know its not much, but considering how hard it is for me to keep my fish alive when i first started i think this is my proudest achievement, lol.
Btw I started this hobby in early 2019