Well obviously youve gotten different opinions....im just speaking from MY experience...i have done this with jardinis and silvers and it worked out fine....maybe you can fast it for a while and if it doesnt give in then feed it some guppies til its full then try again for a while....I prefer to just not feed it until the jar eats whatever food you are trying...ive also done this with pbass just stop feeding them feeders til they take prepared but its up to you what you wanna do...GL