Hi everyone, A quick update - one of the guppies in the tank started flashing so I decided to go with prazi, it’s four days since the second dose so i’m doing the final water change and putting carbon in the filters later today. There’s been no flashing since and everyone’s eating and behaving normal ...

Thanks both, will keep an eye on things.
Also here’s a pic of the fella on the side which he rubs against the substance if it helps.

https://ibb.co/TLNGLgs

Hello, we have a three month old cycled, somewhat planted tank with 5 orange venezuelan cory, 2 otos and 5 guppies. Everything was great until we decided to add three panda cory into the lot without QT about a week ago and now we've noticed one of the Pandas occasionally flashing on the substrate ...