So my HM red dragon is not very well. He has got a mild fin rot(but I am not so sure if it's really fin rot now). His fins have little tears and splits. I noticed he lost 1 scale and an other one turned red(?) or it's damaged(I can't decide)
So today he's got even more damaged scales and I also noticed a black or grey spot/mark next to his eye.
Everything in his tank have been there since I got him, I only put a new hornwort in there a week ago.
Because I thought he had a mild fin rot, I changed the water every other day(25%) and I just got API stress coat+ what I used only once.
So the water parameters are fine ammonia 0,nitrite 0,nitrate 5-10.
(He also had a kind of grass in a plastic pot,but I took it out more than a week ago because I thought that the plastic pot damaged his scale)
He has been acting weird as well,sometimes he would just stop on top of his plant or on the bottom and not move for a minute or more,although I am "calling" him(I open the lid on top of the tank and he swimms really fast to the top usually,begging for food)
He is eating normally,and acting normal except these 1-2 minutes sometimes.
What is causing this? What should I do with him? Please help!