I feed around 10 am and pm, feeding him then won't hurt him. the others covered it, he will be shy for the first few days, then will adjust and eat fine. its normal. As for the 'chocking motion', my fish does this too sometimes. does it look like he's jerking his mouth and front of his head upwards several times? thats just him chewing and swallowing. it will happen sometimes, and some fish do it more dramatic than others.