Originally Posted by FishmanPA
Hmm perhaps. I know when the Chinese Algae eaters grow larger they can tend to be aggressive. My 2 guys are only about an inch long if that and are about a year old. I'll throw in some algae chips to see if that helps the situation, and monitor activity more closely.
Have problem with zero nitrAte readings in two year old tank. No nitrate reading would indicate biological filter (good bacteria) has been compromised,, or is non existent.(unless tank is heavily planted).
Judging from the photo of Angelfish in specimen container, the fish is quite small for three years old as are the chinese alage eaters at one year old at reported one inch.
Looks to be food in bottom of specimen container with the fish? Often is recommended not to feed sick fish for if food is not eaten,, it then contributes to ammonia levels becoming issue with maintaining water quality.
Have these fish been moved recently from another tank? If so,, then changes in water chemistry from one tank to another could have placed the fish under considerable stress if not acclimated slowly,
Ditto if tank is not cycled.
Water must read zero for ammonia,zero for nitrites all day ,,every day,,and if biological filter is working and filters have not been subjected to sudden removal of all filter material,or cleaning of all material in water containing chlorine, then Nitrate reading of some level should be evident and 20 to 40 ppm would be ideal.