Sick Severum with wounds

[asteriqz]

Hello everyone,

This is my Severum, usually stays in a 4ft tank (200L).

I have no substrate or decorations, the only thing in the tank is a submersible pump and heater.

I had noticed some white spots on him (first two photos), he seemed to sit in the corner.

I had gone to my local aquarium shop, (now closed due to lockdown). And he recommended methylene blue.

I had used this on my main tank, after 3-4 days as specified I did a water change.

Before the water change I had found these white worms? Sitting on the glass (picture 3), after the water change they are now gone.

I had noticed a bump day 2 of the methylene treatment, by this day he is now no longer eating and is still sitting in the corner (next to my heater).

I noticed that my Severum was very inactive after water change (25%). I had moved him to a temporary/hospital tank.

The last photos are the current state of him.

I am unsure what to do at this stage, it looks like a deep wound but I'm unsure what it could have been from? Heater?Filter?Glass?

I am getting worried as his health seems to be deteriorating.

 

[asteriqz]

Quick update, the wound has gotten bigger and his eye is starting to get cloudy and bulge.

He doesn't look to be improving.

 

[asteriqz]

I may have to euthanize him, he is very lifeless. Isn't eating either.

 

[itiwhetu]

Not looking good, Fish need a base in their tank and rocks and plants they can identify with. Think about what their natural environment is, that is what their tank should look like. Not a glass box.