I’m here for advice again as one of my P. Compta is exhibiting whiteish marks that seems to respect the litmit of its black markings close to its head region. When looking at the close up photo there also seems to be tiny black spots in the middle of the affected area. Having searched here and on google I could not find something similar to compare too.
I have had the fish for almost a year and a half and I have seen this before on a smaller scale. I thought it derived from fighting but after looking at my own photo it looks like something else.
The fish was never treated for parasites and I wonder if this could be it; it does not look like Chilodonella to me.
The fish is kept in a 144 litre with another male and a large female Ancistrus and I have seen the two males fight a couple of times.
Water changes are being done once per week at roughly 20%.
The readings are: pH: 7 temperature: 25 (I know it’s a bit on the low side and it will be raised when the cories move out) Ammo: 0 Nitrates: 0 Nitrites: 0
I've only had my group less than two weeks, and no prior experience with the species. However, I did notice when they first arrived that the outline of their markings are distinctly darker and appeared as two different colors. Once they settled, and weren't so stressed, the markings didn't look so much like they were outlined because the center portion darkened to the same color.
It is possible that this fish happened to get scarred only in the center area of the banding, but highly unlikely. To me, this just looks like a mildly stressed fish, and will likely return to normal pattern in a short time once the stress is gone. Keep a close eye on it, and hopefully it will return to normal once the source of the stress is gone.
Impossible only means that somebody hasn't done it correctly yet.
Looks to be damage due to fighting. I see it quite often on my breeding colony, large white patches on there sides. On mine its usually on either side of the body below the dorsal fin. It clears up in time. The dark spots may be the dark colored cells starting to regrow in that area.