Hello. My yellow tang breathes quickly, he has stopped eating (sometimes he eats something frozen with garlic extract), his mouth is open although he moves it often, he swims slowly hesitantly and almost always low. He is 12 years old. I don't notice any surface changes on it. For a month, his condition did not change.
Other fish are fine. I struggle with cyanobacteria, but RO was lab tested as satisfactory. The skimmer is always on (deltec 1000), medium AL99, ceramic ring and I use the triton method.
I do water changes every 2 weeks (60l per 400l tank). My KH is a low 7.3; No3 0.5ppm; PO4 0.03ppm; salinity 1.025; temp. 77°F (25°C)
video: https://photos.app.goo.gl/nLeJEG639qyuDAM29
(yesterday i clean sand and he have sand on his surface)
Thanks for help
Other fish are fine. I struggle with cyanobacteria, but RO was lab tested as satisfactory. The skimmer is always on (deltec 1000), medium AL99, ceramic ring and I use the triton method.
I do water changes every 2 weeks (60l per 400l tank). My KH is a low 7.3; No3 0.5ppm; PO4 0.03ppm; salinity 1.025; temp. 77°F (25°C)
video: https://photos.app.goo.gl/nLeJEG639qyuDAM29
(yesterday i clean sand and he have sand on his surface)
Thanks for help