Currently, gotta be my closed brain, I've had it for over 6 years and grew it from a baby. For an idea on size I would say it's currently pretty close to the size of an actual human brain. And yes my clams are that big
I did however have some large SPS corals in my previous tank
Biggest was the blue formosa on the right which when I sold it wouldn't even come close to fitting in a 5 gallon pale. It had to be broken into 3 pieces to fit in three pails.