boil or bleach bath all the bio media...
replace mechanical media.
I personally would do a bleach wipe down on the inside of the tank.
After the bleach, rinse everything REAL well...and use dechlorinator to help get all the bleach out of the media and tank.
If you smell bleach, keep rinsing...
Then I'd fill and run the tank without decor or substrate for a few days to let any remaining bleach evaporate.
Nice find...congrats!
replace mechanical media.
I personally would do a bleach wipe down on the inside of the tank.
After the bleach, rinse everything REAL well...and use dechlorinator to help get all the bleach out of the media and tank.
If you smell bleach, keep rinsing...
Then I'd fill and run the tank without decor or substrate for a few days to let any remaining bleach evaporate.
Nice find...congrats!