Folks...I need your advice.
One of my discus (the smallest and the most bullied one in the group), suddenly has a big cut on its head. Its like someone has scratched it's head with big nails! It is otherwise healthy looking...maybe a tad bit darker than I would like it to be. I am hoping this is not a hole in the head disease.
I am still doing daily 25% water changes and my ammonia & nitrite is 0. Some green dust algae on the wall due to long exposure to direct sunlight.
pH is 7.2 to 7.4. Temp at 84-85
I planning to use seachem stress coat while changing water today.
What else should I do?
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