I have a 20 long that I’m converting to sump. Right now I’m at 7 inches for overflow that will run into sock and then go into a small chamber with matrix in some bags and then lead into a decent sized refugium. What has been working best for you guys in terms of substrate? And chaeto is out of stock in a lot of areas so I was going to go with sea lettuce and reg ogo from algae barn, are those good macro algaes? Do I add the algae when I first set the tank up or after it has been cycled? Thank you.