For some reason the johanni/maingano cichlid I get from a nearby petsmart always usually eventually end up sickly or dies. I don't have any problems with the other mbunas and I'm sure my Johannis aren't getting bullied, but after a while they always usually stop eating, and become more sensitive to any water change than another other cichlids. I do not know what I'm doing wrong. I do weekly water changes and all the other cichlids in the same tank are healthy.