my HMPK, Theo, is partly blind. to combat that tiny issue, he's in a 2.5 gallon glass tank, bare-bottomed, i never rearrange his tank, and he eats from a feeding ring. smart little boy, he picked up on everything so fast.
having a large, flowing plant in the tank might help your boy if he gets scared. Theo has a huge, flowing pink plant that takes up half the tank when fanned out to hide in.