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so. my pirhanas are growing up so quickly! does anyone know how long it takes for them to get to their mature size approximately? Also... how can you tell the sexes apart.. or when can you? Anything to do with differentials in the fins?

72 gallon bowfront:Tanganyikan Lake set up
75 gallon: A. Baenschi trio,Cyanotilapia Afra Cobwe(4), copadichromis trewavase, protomelas sp. tangerine tiger(breeding pair)

the above post is wrong there is no real sexual dimorphisim in piranhas
watching them breed is the only true sure way to tell short of disecting them
they reach breeding maturity at around 1.5-2 years

if housed n kept properly theyll grow very fast for the first 6 months then begin to slow down in growth but they never stop growing

red bellies grow .5" a month for the first 6 months if kept properly then after that they grow bout 1-1.5" a year

they should hit 6" in the first year maxing out at 10-12"

other piranhas grow slower such as rhoms they gain .5-1" per year

good luck wit ur fish n i hope u succeed at breeding them