Emergency chromis are killing each other!

[PokeFish]

I've had 3 chromis all doing ok for about 3 months now. Not sure why they started fighting. Maybe it's because I've been feeding less to lower elevated nitrates. 2 are dead and the last one has an injured tail. How to I help the last chromis recover? Also... what happened to this guy :

 

[windemerejack]

What else have you got in the tank?
Chromis will eventually kill each other until only one is left but that was not done by another chromis imo.

 

[DeniseAndy]

Chromis will be chromis unfortunately. Many fish will be fine over short periods (year up to two) then they will mature more and become more aggressive and territorial. Fighting and death ensues. I am sorry.
If the last is still eating and such, try some antibiotics in food to help with any infection onset. Other than that, you can take out into qty and treat if needed.

 

[DeniseAndy]

I think the damage is from the cuc after death. Looks pretty eaten up.

 

[devocole]

I like chromis. They will bully eachother for sure. But underfed chromis will kill eachother. Since feeding more my chromis are fine. I've been through the underfeeding killing. Now well fed chromis are fine.

 

[Reef Box]

Chromis do exactly that. I started with 6 and within a month I was down to two. Now I’ve had the same two for 2 years.

 

[PokeFish]

OK thanks! So in conclusion: I should qt it and feed it more? Also I only have snail cuc. Except for 1 hermit... but it died only for a bit before I found out.

 

[windemerejack]

OK thanks! So in conclusion: I should qt it and feed it more? Also I only have snail cuc. Except for 1 hermit... but it died only for a bit before I found out.

It doesnt take long for cuc to devour a dead fish.