Really... I didnt know this. I thought they were fast growers.
I got mine around 4" and they are 8" or so, maybe 3 or 4 months ago. But they havent hit the slow mark yet... I feed daily and do 75% water changes 1-2 times a week. Feed 2 times a day Cichlid Gold and market shrimp. I keep the tank at about 83*
I plan to add some strong current in the tank soon and will keep a close eye on the growth.