Some info says 4" is the max size. Some say 5" is the max size is what I've read. I seen some claims of 8" but one persons eyeball sizing at 8" might actually be only 6" I think if you raise them small feed them good you might get them to there max size of 5-6". I bought some at a small size 1.5-2" been feeding mine really good they been growing good. I hope to grow mine to 6" will see i'll let you all know if I grow mine any bigger then that.