They do grow real fast but it would depend on several factors, such as tank size,water condition,diet,temperature, etc. I would say a 6'x2'x2' would do an African Aro good for 1 to 1.5 year or less. You would need a minimum of a 6'x2.5'x2'(225g) to house an African Aro for life, but I would suggest 8'x3'x2' or bigger.JamesF;4998530; said:From what I've heard from people here, they are one of the fastest growing fish you will ever see. Not sure how long to hit 18". Persoanlly I wouldn't keep one in anything smaller than a 300.
I think Hao gave you 30" wide,72" length at the least.BayArea_510;4998908; said:hmm well in a year i would have a 96", 24 ", 30", L.W.H would that work