Pleco Strange Injury

[Shabba82]

Can anyone tell me what this is?

Plec has developed a spot on their left fin, it has now turned Red. Looks irritating for my pleco. It's a Gold Spotted pleco. My pride and joy.

Im new to fishkeeping, I've had various issues, my tank is overstocked and I had high ammonia and also treating for whitespot. Though my pleco is still active and feeding. Cud it be whitespot tho its turned Red? Another parasite? Or maybe an injury?

 

[Shabba82]

Most ideas on this seem to be a possible fungus? Not sure. Shud i try aquarium salt, though I know plecos are sensitive to a lot of treatments.

 

[Shabba82]

http/www.simpleimageresizer.com/_uploads/photos/b1c1a626/Screenshot_2016-05-26-22-01-18_50.png

 

[Shabba82]

http/www.fishlore.com/fishforum/attachments/freshwater-fish-disease/186432d1453831132-growth-fins-rubbernose-pleco-image.jpg

 

[Blough]

It sounds like your tank isn't cycled, being the reason for the ammonia levels. A cycled tank should not have any detectable ammonia. I don't know if this is what is causing your issues with your pleco or not. You are now in a fish-in cycle, and with the tank being cycled we usually recommend that you return the fish to your LFS/find another home for them and take the time to do a proper cycle. We have some great resources about cycling your tank in the cycling section of this website; please read them as soon as possible.  http/www.fishforums.net/index.php?/forum/291-cycle-your-tank/
What fish do you have in your tank? How big is it? How new is it? Is it filtered and heated?
Good luck!