Welcome to the forum
C
Cordyceps
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That will likely work, I feed my knives after the lights go off and lure them out with bloodworm. Its sad that people keep pets for novelty, I have a snake but he is a pet not a decoration....
Does he have a hiding spot that he frequents? it might work to put food in there, and how long have you had it since It may still be warming up to the conditions.
For example my brother rescued a khuli loach from someone we know but he rarely saw it and all the food was picked off by his danios before it hit the gravel, but now I put it in my betta tank with sand and he spends more time out of hiding than he ever has! make sure your conditions are right and give him time. Good luck!