Early signs of DGIV?
This is mars, a dwarf gourami I've had since February of this year and the first fish I got after coming back to the hobby. When I got him I assumed he was already at a mature age considering his size, coloring and the fact that he started making bubble nests a few weeks after settling in.
The tank is a 15 gallon planted tank as seen in the 2nd photo. I have no means of testing the parameters as test kits are very expensive where I'm from, and I'm just a highschool student who lives with his family.
In the case that this is actually DGIV, what's the best course of action? Should I let mars live out the rest of his days peacefully? Or should I euthanize when he seems to start struggling to perform his usual behaviors?
On a side note I was planning to redo the whole tank (plants and hardscape wise) before I head of to college, and I hoped that I would have mars as a semi long-term habitant, but I fear that after seeing the dreaded spot on his head, this may no longer be the case.
All advice and criticism is welcome, thank you greatly