It is time to move everything (being seven things) from 20L into it's new home in the 55! I just have two small fish, feather duster, conch, and 3 small corals to transfer. What is the best way to do this?
Are you today, or sometime in the future?
The best way is to set up the new tank, with the same perimeters (temp, SG, Alk, Ca) as the old tank, long before you move them.
