My 3 Banggai cardinal have the hole in the head disease

I bought 3 Banggai cardinal 2 months ago and last week I notice that one of them as a hole and the others 2 are just starting to have a hole. what should I do to help. From what I understand of the disease is that is poor water quality, I thought I was doing ok maybe I am wrong.

My tank is 120 gallons I do water change every week (5 gallons). I use RO/DI and my meter read zero. I use reef crystal for my salt.

Any thought or suggestion to help my fish.

Ho, I had an outbreak of cyano and I used red slime remover could that of done it?

Thank for any help

 

I believe it can also be caused by stray voltage in the tank. Do you have a grounding probe in the tank?

 

no I guess I should get one. My other fish are fine. Where do you put that probe in the dt or sump?

 

I would just put it in the sump, just make sure you plug it into a properly grounded socket. It's a very cheap but necessary precaution to have in your tank.

 

Thanks, I will be going to the store then. How long will it take for my fish to hole to go away?

 

Not completely sure, i've never dealt with it myself (knock on wood). My lfs has a purple tang that had it a few years back and the scaring is still visible. Just make sure to feed foods soaked in garlic and hopefully it will heal up for you.

 

Well I had a meter to mesure electricity wich i did not know and it read 0.3 volts so that could be my problem

thanks alot 3reefers

 

Yeah get that probe installed and keep them well fed and hopefully it'll turn around for ya.

 

After i tested the water i did some more research and figure out i could find the source of the problem and i did it s the damn HEATER. I will replace that as soon as i can.

 

yea, having the probe is still a good idea you never know when a powerhead seal will blow on ya.