A Cacatuoides white tip on dorsal ray

[Neptune's Neighborhood]

So my male triple red cacatuoides was from the same place that I got my doomed male agassizii.

He is in a 20L NH3 0, NO2 0, NO3 < 1; pH 6.6, dGh 1, dKh 2
He's with two female cacatuoides and three pencilfish.
The tank is fine, in fact both females have fry right now, so he's been pretty busy. I haven't noticed any excessive aggression, a little chasing but no nipping.

Since he got in a fight with my agassizii during quarantine, he developed some bumps on his lips. I figured scar tissue, that was 4 months ago. Today, I noticed one of the rays on his dorsal has developed a white tip. It does look fuzzy. I took him out and swiped him with some pimafix and the white tip did not detach from the rest of the fin. I'm thinking fungus, but not sure how to treat. Pic and Video. http://flic.kr/p/e5HXGY

 

[Mike Wise]

Looks like fungus on a damaged spine to me, too. It doesn't look too bad, healthwise, to me. If it were my fish, I would just make sure the water was very clean and let the fish's natural immune system take care of it. If the spine actually starts to erode, then it's more than just fungus living on dead skin. I would put him in a separate hospital tank and treat with a gram-positive antibiotic like erythromycin.

 

[Neptune's Neighborhood]

Thanks, Mike. I QT him in a hospital anyway and did a WC on the other tank. I figure he might feel better alone rather than trying to defend all his fry

 

[Neptune's Neighborhood]

he died

 

[Mike Wise]

Sorry to read that. I doubt very much that the minor fin rot was the cause, however.