This Dat has been kinda sick for the past 2 days, now he had a bloody mouth. Or what looks like it to me. What do you guys think happened? Injury? Parasite? Something else? How should I treat him?
I've put him in the hospital tank with the local resident, but sectioned him off so he's alone.
Treatment: Isolated him, treated with Melafix for 3 days, then did a 20% water change. Then on day 4 the Dat died.
Physical signs: At first had blood read streaks around gills, then on day 2 more red behind gill covers. Then day 3 redness started to disapear, and the fish started swiming in the water flow at the surface, but seemed ok. Then day 4 death, stayed at the bottom on side gasping.
I cut the fish open: No swelling on the gills, or stomach GI track. No blood in GI track, no real signs of anything abnormal, atleast to this untrained eye.