flicking and scratching

You have moments where you know something is wrong and I’m having one , for a while now after adding a few baby plecos I have noticed other fish scratching in the substrate and glancing off rocks , I added all my fry into the tank firstly in anticipation they would get culled by the other fish...

Last year I noticed occasional stringy white poo, no body marks or visible bacteria/fungus, but the fish were itching and rubbing off rocks a lot. The first time it happened, I tried all kinds of meds, and then eventually Waterlife Sterazin seemed to do the trick.   A few months ago (after...