For a long time my cats wouldn't eat over 1/4 of a 6 oz can at one sitting, about the same as what you're saying. Do you feed them twice a day or 3 times? They'd probably eat the other half the can as a second meal. I've found if I put out too much wet food the cats never get around to eating it all but if I divide it up, they eat what I put out and are ready for the rest when i put it out 6-8 hrs later. They're fickle, at first I was feeding them 3 times a day but they started picking at it so I went to twice a day and they did fine that way for a couple months, then just in the last week or so started acting hungry about the time I get home from work (2pm) so I went back to 3 times a day. They get the same amount, just split up differently. I also rotate brands so they don't get bored, and/or deficient, just in case...