That appears to be a Schnieders Dwarf(smooth front if youd prefer), which if it is, unless you got a male and a LONG time you wont see 6ft or even 7. If its a female(which mine is) youll be lucky to see 5 ft.
Did you get it as a hatchling? What temps do you keep it?
I have had it sence it was about 8 inches it has now been 3 and a half years and it is now 26 inches. The enclosure I built my self measures 5ft long by 3ft wide and 3 feet tall. I keep the water temp at 80 and the air temp around 73-75. I feed it dead mice as you can see in the video and a few other things on occasion.