Who Gives A Fish Forums

I've had mixed results with Hornwort in brackish water. It grows fast but can be a bit finicky with salt levels. Maybe start with something easier like Java Moss.

You're good. I've had a similar experience with my black sun coral colony - it bleached most of a branch, but bounced back with proper feeding after being neglected for 10 weeks. As long as algae doesn't take over the discolored areas, you should be in the clear.