Hi, I have 3 axalotls all in same tank. We have had them for about 6 years now. There are 2 males and 1 female. Recently the female has not been eating. Males still got a good appetite. Did water check and nitrates were bit higher than expected but nothing extreme. Doing water changes every other day to try correct this and pump cleaned regularly. She is still not eating and it is getting close to 2 weeks. Any advice as to what else to try?