Suspicious illness of my zebra danio.
For weeks, his tail has been droopy. He had signs of dropsy, but now they're gone. Is there anything I can do for him? Thank you in advance for your advice.
Tank size: I don’t know the exact volume, but based on the tank’s dimensions, I estimate it to be around 10–12 liters.
Fish size: Approximately 3-4 cm.
Tank mates: None. The fish is currently isolated because it is sick.
Water parameters (ammonia, nitrite, nitrate, pH, temperature): I don’t know.
Filtration: I don’t know .
Water changes: I changed the water a few days ago.
Other information: The fish is showing raised scales, so I am concerned that it may have dropsy.