I always get good growth out of my gobys, plenty of live food and good water and they will grow. I have a older thread for a female that I grew out for a year from 3 to 10+ inches. Had another male that I grew from 2 to 18 inches in under 2 years, he was feed crazy amounts of live food though. This little male is growing really good also just hope he keeps it up.Wow that's a great growth rate there.
I wish my lfs brought some in at that sizeI actually saw some of these today for sale... just by eye-balling it i would say they were a good 12-14" a piece...
Nice looking fish, just a shame they would likely eat everything in my tank...