blind fish

My engineer goby is going blind. It started all of a sudden and it’s not effecting my only other fish (a four strip damsel). He’s is literally methuselah. Hes around 18” long in my biocube 32 and that we know of (who knows how old he was when he was bought) he’s 10 (at least, we can’t remember...

So I have a hippo tang that I recently had to undergo what seemed like an ongoing battle with velvet. After 2 copper treatments and a 7 day treatment with ich-x the velvet is finally gone. I’ve had this tang for 7 years and would do anything to keep it alive. My struggle now is that I believe...