First off, "sis" would be more appropriate.
I had a Placidochromis milomo that was completely blind and he died out of fear and starvation. He was too scared to venture out to eat and starved.
With this guy, I was afraid of him doing the same, being too scared to eat, and I seriously considered putting him down but after maybe two weeks of being blind he would come out and dig for food.
He's been in a 5 since I bought him to make it easier to find food. Less space to have to forage around but I've upgraded him to a 10gl recently and he's been doing very well. He pigs out every once in a while (when I feed bloodworms) but for the most part keeps a sleek profile. Hopefully he'll last a while, he's done very well so far. I really like him.