Just like us a betta will not eat if he is feeling sick. Improper water paramaters will make him feel really terrible. And if he has nowhere to rest or hide then this will increase his stress. Bettas can go a week without food but three weeks means something drastic needs to change.
Felony theft is committed when the value of the stolen property exceeds $1000. Regardless of the value of the item, if it is a firearm or an animal taken for the purpose of animal fighting, then the theft is a Class 6 Felony.
Stealing is a seen as a criminal act, and therefore depending on the circumstances, jail time can be given. Generally speaking, for first time offenders who steal something of minimal value, typically under $25, they will be asked to return the item(s) and not be allowed to reenter the store from which they stole.