New to marines 4x2x2 scrubber size confusion help plz :(

[sirio]

Hi got my first wee nano cube about a month ago and loving so much so iv got myself a 4x2x2 with sump and cab, so just trying to get all my plumbing sorted out now and iv been reading its calculated to the size of your tank but now iv found out it is now calculated on feeding.So im working it out based on a friends stocking and feeding my fish maybe slightly different from what he has but its a rough guide to what ill be stocking can someone plz tell me what size scrubber I will need for a vertical scrubber thanks for any help. (really want to start building it tonight all the stuff is here waiting lol)

2 clowns
Snowflake blennie
Orchid dottyback
2 mandarins
Yellow watchman
2 cleaner shrimp
Pistol shrimp
Sun coral
a couple pinches of pellet early in the day then a cube/cube n a half of frozen at night

[Floyd R Turbo]

I would start with at least a 24 sq in screen. It wouldn't hurt to go to 48 sq in though. It sounds like you already feed a good amount, and will probably desire to feed more, which is good for your tank while running a scrubber. It only gets a little rough on the pocketbook, but not needing to pay extra for media & PWCs can offset that a bit

[SantaMonica]

Welcome. Try a 6" wide by 8" tall screen, and put an LED floodlight on both sides.