In water with a pH below 7 ammonia is converted to relatively harmless ammonium, it still shows up as ammonia on a test kit but its not as bad as ammonia. This is also the reason why many of the soft water species (discus, appistos, most catfish etc) react so badly topoor water quality, they quite simply have never been exsposed to ammonia before.
Popeye is usually caused by a injury from either another tankmate or banging themselves on the tank decor, in the case of a black shark i would go for the second one as they are large and clumsy fish. Daily 10-15% water changes and dosing with melafix for a week should get the fish back on the road to recovery.
Popeye is usually caused by a injury from either another tankmate or banging themselves on the tank decor, in the case of a black shark i would go for the second one as they are large and clumsy fish. Daily 10-15% water changes and dosing with melafix for a week should get the fish back on the road to recovery.