I am not buying a tank at this time I was given a tank yesterday still trying to figure the size will post mesurements later maybe someone can help with that.. I am going to save now to buy a 90g to 120g by Oct. for both O's I just spent $600+ little over a month ago for the 55g set up.. If i see a problem once i get the other O I will take him to my lfs and give him away I like O's to much to hurt him.. Or if the other tank( Im sure it's a least a 40g to 45g) is big enough I will set it up for him until I get my bigger tank in Oct..