Alright so i decided to keep the tank i have and complete the conversion from brackish to fully saltwater by taking out the freshwater gravel and
driftwood. I have a couple of questions because basically i have no prior knowledge about saltwater tanks at all. After i pull out all of the gravel and decorations, which i think will still be possible with my puffers in the tank, how would i go about adding sand, and
live rock? Also this tank used to be a planted tank and have no knowledge of any saltwater plants so any help is greatly appreciated.

i wanna get this figured out because i have waited i long time for this moment haha, been converting the tank for like 6 months.