What is wrong with this Cory?

[underthesea1]

Linking my last thread encase it has any bearing on this

Tank refresh/ restart after persistent milky water

For the last month my water has been very cloudly/ kind of milky looking. I have done a water change twice, added Sachem clarity, hoovered the sand but I think we might have an algae bloom and it just isn't clearing. I think perhaps one or two of my cories have passed, but because the water is...

www.fishforums.net

Just checked my tank now and it's the clearest it's been in ages (not perfect but better than it has been) finally got to see that I definitely still have 5 copies, couldn't see the 6th so either that one passed and that is what caused the bloom or I just couldn't see.

New tank arrives on Thursday so will spending the day transferring everything over.

But I did notice this on one of my cories backs which looks concerning?

It's not the clearest photo but almost looks like a chunk of it's back is missing

 

[GaryE]

That's a bad injury, but it doesn't look infected to me. Any ideas on what could have cut the fish like that?

 

[underthesea1]

No idea.

There is a tiny bit of stone in the aquarium but most of i I removed to try and see more of the tank.

There is only a Molly, shrimp and snails in the tank.

Nothing that could hurt it I don’t think but I don’t want to ignore any dangers!

 

[fishorama]

I would start with frequent water changes to see if that helps. Do as many as you can daily or every other day if you can. Keep an eye on it for redness or fuzziness. You may need to treat for an infection, likely bacterial. I don't know what meds to have available in the UK, Esha in various forms?