I just got 2 glass fishes and im not sure about a couple of things..?

My two glass glass cat fishes are clear 😀 not painted.
my friend gave them to me. i feed them regular fish flakes.
one fish’s wisker isnt straight and it doesnt move as much as the other.
it tends to lay down sideways 🙁 and it scares me.
please help!
also, can i feed it fruits/vegies? i dont want to buy bloodworms ot mosquitoes larva cuz it creeps me out a bit :/