I really want to make a cactus farm but I don't have the sand to do it. How does one obtain sand on Skyblock if it is illegal to trade it?
use red sand from /warp donor or trade redsand - legal use a sand generator and turn red sand to white or buy donor 25+ for sand in kit or coop with someone donor 25+ for their sand (but you cant take any of it if they leave ur coop) Assuming this is for net. For org it is obtainable at /warp shop
If you're cooped, you own the island together, so you're allowed to share items. I think Krissy basically answered your question spot on xD
