how big can sailfin get in a 70 gal before he should be dona

[desktopsilver]

how big should i let my sailfin get before i donate him,to a large aquarium

 

[imow]

FWIW... I have a sailfin im ny 72, going on 5 years. He is a little shy of 6". Still seems happy. Just make sure he has enough swimming room.