Sarcophyton Leather shrunk

Over the past year, my Sarcophyton Leather has shrunk to about 1/2 its original diameter.
When fully open, the leather used to measure about 7 to 8 inches in diameter.
Now it appears it has shrunk to about 4 inches.
He also doesn’t open his polyps as much as he used to.
They only protrude a little bit now, and this thing used to be wild.

I have not added or lost any tank inhabitants in over 2 years.
I have not changed my tank maintenance and my water conditions have not changed.
I have even performed several extra 25% water changes about 3 months ago, but the leather is still small.

Any ideas as to what might have happened?

Thank you in advance,

Matthew

TANK DETAILS
46 Gallon Euro Bowfront Tank
36" Nova Extreme Pro 6x39w T5 (2 hrs dawn, 11 hrs daylight, 2 hrs dusk)
45 pounds of Florida Crushed Coral Substrate
45 pounds of Fiji Live Rock
(2) Maxi Jet 1200
Shatterproof Heater
Emperor 400 Biowheel Filter
Tank Established for over 4 years

CORALS
(2) Sarcophyton Leather
(1) Flower Leather
(1) Purple Finger Leather

Fish
(1) Blue Devil Damsel – Chrysiptera cyanea
(1) Banggai Cardinal – Pterapogon kauderni
(1) Lawnmower Blenny – Salarias fasciatus
(1) Saddled Valentini Puffer – Canthigaster valentini
(2) Blue Velvet Damsel – Neoglyphidodon oxyodon
(1) Brown Scopus Tang – Zebrasoma scopas

INVERTEBRATES
(5) Turbo Snails
(1) Scarlet Hermit Crabs

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