[Dearth]

I've brought a few brains back from the brink and as everyone else has stated keep the wound clean and keep it in medium to low flow with medium to low lights you can feed or let the light do the feeding depending on the severity of the wound it may not grow back over the skeleton that was exposed or it may expand. Keep an eye on it you should know within a couple of weeks which way your brain will go.

I also love bumblebee snails they helped with 2 of my brains survival when they were damaged by eating the dead and dying flesh but find what works for you as brains are delicate but are also hardier than you think