Help treat dwarf petricola with suspected algae

[Neonlights]

I haven’t posted in a long time as my aquarium has been a very happy place for the past 12 months. In fact, my dearf petricola bred! It’s the first time I’ve ever bred egg-laters (and I wasn’t even trying to!).

It’s a beautiful little fish but this evening I noticed a white mark/growth on its side. I’ve added aquarium salt to the tank, but is there anything else I can do?

I only have this one tank so no option for a quarantine aquarium. @Colin_T you provided me with advice a year ago that saved my cory (still happy and healthy today), do you have any suggestions?

 

[Neonlights]

I just remember I have NTLabs anti whitespot and fungus treatment which has worked a treat in the past. Should I add this now (with the salt in there), or do a water change and then add it?

 

[Colin_T]

Need a couple more pictures.

How long has it been like that?

Is it still eating normally?

The fish has a pink head, which usually indicates an infection. It might have been spiked by another fish or injured by a rock and the white stuff is inflamed tissue covered in excess mucous.

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Treatment until more info is to do big (75-80%) water changes and gravel clean the substrate every day for a week or two. This dilutes any disease organisms in the water and reduces the chance of further infection.

Wipe the inside of the glass down to remove any biofilm that can harbour pathogens.

Clean the filter if it hasn't been done in the last 2 weeks. Wash filter media in a bucket of tank water and re-use the media. tip the bucket of dirty water on the lawn outside.

You can add salt if you like but do the water change, gravel clean and filter clean first, then see how the fish looks after a couple of days of water changes. If it's no better than add salt.

 

[Colin_T]

I just remember I have NTLabs anti whitespot and fungus treatment which has worked a treat in the past. Should I add this now (with the salt in there), or do a water change and then add it?

It's not white spot and fungus can be treated with clean water and salt.

Do water change, gravel clean, filter clean first, then momnitor for 24-48 hours. If it clears up within that time, then don't do anything else except water changes and gravel cleans for another week. If it doesn't improve, try the salt with or without the medication. But it depends on what other fishes are in the tank?

 

[Neonlights]

@Colin_T thanks! I’m not sure how long it’s been like it as he’s very timid but he looked ok a couple days ago and he’s eating normally (just not as visible/confident as he was a week ago, but I think that’s just a change in behaviour as he matures).

When you say wipe the inside glass, should I clean it with the razor blade scraper I have or just wipe with a cloth?

 

[Neonlights]

Other fish are a cory, a honey gourami, some tetras and an oto, as well as shrimp. I used the salt previously, safely, with the same fish in it.