I have mine since the switch over from freshwater about 3 years ago. It was only about 1-1.5", now it's at least 3". It survived through some horrible conditions in my tank. From sloppy tank transfer in the winter, salinity as high as 1.041, H2O2 overdose, to an ich outbreak.
And it's always a model citizen in my 40B. My sixline wrasse, OTH,........