Okay. I will try to get the water tested for ammonia and nitrates at the store. The brown growth, however, doesn't seem to be the result of attacks
from the congo tetras. The congos have never attacked anybody in the tank, not even each other. I believe the brown growth has to be a fungal, bacterial, or parasitical infection.
I will try to constantly perform a 1/4 water change every week. In terms of updates, I forgot to mention that the brown growth has appeared at the upper part of his tail fin.
If you consult the pictures
, you will see what I mean. But my questions are these:
Should I buy any medication to treat the brown growth, and if so, are there any medication that are safe for the other fish?
Is Melafix antibacterial fish remedy safe, and is it good in treating fish diseases?
Is it necessary to quarantine the infected Diamond Tetra?
If I follow 1077's advice of weekly water changes, filter maintenance, and varied food diet, will the brown growth disappear? I have posted some videos that you could download to have a better idea of what the brown growth looks like. They only take 15 seconds to download (only two 11 second videos). Observe the diamond tetra's dorsal fin. MEGAUPLOAD - The leading online storage and file delivery service
Fish Video 1 (11 seconds) MEGAUPLOAD - The leading online storage and file delivery service
Fish Video 2 (11 seconds)