I guess I found a factor that cause his sickness (not 100% sure). Might cause from some type of warm that came with the algae.
My assumption as follows:
This couple had been great together for the past 45 days in 24" tank alone (no other fishes). However, 2 days ago, my girlfriend went to Department of Marine Development in Thailand and brought back some type of algae. Base on what she said, it will help bring down the ammonia level in the tank. So, she added it for me.
About 30 minutes ago, I tried to separate this female out from the tank, so I have to remove the algae. Then, I found 2 worms in the tank, 1 in algae and 1 on floating on surface. Do you think this worm would be a root cause? If so, what kind of medication I should use?
Now, I just used fresh treated marine water mix with Cifloxin and put an oxygen in separate container. Any other recommendation?
See the pictures.