Ok some bad news. After the one started showing bad symptoms, i seperated it in a floating cup, and it passed the next day :( RIP. A couple of days later i have 2 SUPER RIDICUOUSLY active cories, refusing to stop swimming lol. Just this morning, my second corie repeatedly buried himself FULLY under the sand. I didnt see him, so i checked everything, untill i saw his tail sticking out of my sand, as he was head down tail up. I seperated him in the floating cup, and gave him a pellet which i dont think he touched. He is breathing VERY HEAVILY, like he ks oing to have a heart attack. He has been doing this for a while now, and im very concerned. My other corie doesnt seem to have a care in the world, is eating and growing fatter each day, and being active.
I am not sure what to do. My ph is stable, and ammonia is under 0.02 ppm.
The one that recently died looked like it could have had ich, but i couldnt really tell on its light plates.
to reduce disease should i do a 75% water change? Im REALLY WORRIED.