Hello,
On Wednesday, I've notice one of my cardinal tetra has a string looking thing on the side of his body? I assumed it was a string so I left it alone. Today while doing a water change I notice the string was still there. So I caught the fish and tried brushing gently it off. But it was stuck? Does anyone know what the string is? Also another one of my cardinal has a hole on there head? And another one look shrivelled up?
Please help.
Thanks