Calcium Lack Paralysis or Back Injury???

[Louis Charles Bruckner]

That is a good start.
I would also cover the sides and back with some kind of background material , it can be as simple as a brown paper bag.
This will lessen stress on the poor fellow.

Hope he gets better soon.

I moved him into a different tank today that has nothing in it, aside from damp papertowels and two fish tank decorations for him to hang on to or mess around with. One's a bridge, and the other is like an old sunken barrel. Nothing he could hurt himself with