does anyone know what this could be

[pitlady]

I noticed some of this on my Giant Groumi (2 feet long) five days ago and yesterday it got 2 times worse. My arowana (1 1/2 feet) 4 days started to peel too. 4 stores said with my description that it was a fungus so I started treatment with maroxy. 3 days ago I came in and the arowana and my fire eel was dead. My foot clown knife looks all faded and the groumi is still getting worse. I brought a picture into a pet shop 3 days ago and no one knew what it was and have never seen something like it before. My veija and jack dempsey are doing ok right now. Oh and yesterday all the fish were at the bottom of the tank and were coming to the top for air (also breathing heavy).
Can anyone help me? I am in the middle of the treatment so I can not change to anything else. I think I will be losing the groumi and clown knife before the end of the day since they do not look good at all but I would like to know what it is since I moved so quickly and killed them rapidly.
I have a 200 gallon tank and I change 1/3 of the water once a week. I keep aquarium salt in it and use slime coat. I have had the tank set up for over 2 years but only had the larger fish for 3 months now. They were all eating until five days ago and were really healthy. Here is a picture of the groumi’s side and the arowana’s back that I took it one day before he died.





I had the water tested at petco and everything was in the normal range. He is a more recent picture of the groumi (one day later and two days after treatment). I do feed these fish live goldfish and petco said it could have been from them. Is this possible? I over filter all my tanks too. If anyone has seen something like this please advise me of what it is and where it could have come from. Thanks again for all your help. sorry the pictures are sideways but it is of his head. His head is the worst and he looks sunburned now. The rest of his body still looks like white stuff is coming off of him. These pictures were taken yesterday (3 days after I noticed the problem and he died last night. whatever it is it moved very fast in my tank. The clown knife, jack dempsey and veija are still in the tank (clown knife is starting to look like the arowana did before he died). I also have 2 plecos in the tank.





Any advise would be helpful. I have no clue what it could be. Oh I also fed them feeder fish (40 every other day). It seems to only be affecting the fish that eat the feeders too. Thank you in advance.

[bs6749]

I was actually going to ask what you feed them. I suspected that it may have been somoething from feeders or live foods but I honestly have no clue what it is as I've never used feeders and don't know of anything that could be causing that. I think you have figured out what caused it though...tainted feeders.

[Zagz]

Well I don't know exactly what it is but will ask did you do a water change in the last couple of days? I would look into treating with Jungle's fungus elliminator as it does treat for both bacterial and fungus issues. I realize treating a tank of your size is very expensive.

Sorry for your losses and good luck saving the last of your fish.

[billijaywest]

the size of them fish is unbelievable

[pitlady]

what do you mean the size of the fish is unbelievable. That is the size they were. The clown died today. All I have left in my tank is the veija and the jack dempsey besides the two plecos now. man my tank looks empty. Has anyone figured out what it may be yet? I still think it came from the feeder fish. That really sucks.

[Zagz]

It may very well have come from the feeder fish. So sorry for your losses. I doubt you will be able to have a definitive diagnosis. It's a real shame that if it were the feeder fish.