I have tested the water and the everything is okay. Nitrates are at 30ppm so a little high but no extreams.
The tank is a 100gal running two externals (a fluval 405 and 406) as well as a powerhead. I do a 40% weekly and feed the fish once some times twice a day. The current stock is quite low - there is himself at 7" and two juvies at 4", a orangeahead at 5" and 4 juvies at 2", 3 angels at 1.5", a green phantom plec at 3" and a few tiny lemon tetra, as you can tell most of the fish in the tank are babies.
He is the biggest fish in a tank with minimal aggression and has endured far worse times in the time that I had him (2 tank moves, fishing other fish out etc). He also done suprisingly well when the tank went through a mini cycle about a year ago so I dont understand why he is doing so badly now when his conditions are pretty good.
One thing I will say that could be part of the issue is that this species is known for being quite susceptible to hole in the head as they get older as they are a soft water species. My water is also quite hard and I also have a Ph of 7.8 which is also high.....im not sure if this could be the reason?
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