So my 5 year old Leo Hen hasn't been eating for a couple weeks now and he is super skinny he smashes tilapia but now he isn't accepting anything I even put live night crawlers in front on him and wants nothing to do with them I added salt and prazipro still with no success all my other Rays are eating like a beast I haven't added anything new to the tank or anything besides another immature male and he is breathing very heavy and hard. Please any help would be appreciated Thanks.