What to put in refugim

[aerialdronemaster]

Hello

I have a red sea reefer 350
It's a new install,.already cycled and working nice .

What do you recommend to get from bsk to put to refugium.
My goal is add something for better filtration, possible growing pods .
Any recommendations? Blocks, food, some special leaves, flowers

Thank u

 

[Spare time]

Just macroalgae and nothing else. This helps keep it clean.