For the width i personally would get the 75 cm...it's up to you....Tigriuns™;3831022; said:Just measure it is 13" I am still thinking of the width should I get 60cm or 75cm.... shifting it to the bigger tank will be a problem... never kept such a fish that want to knock me down the moment I am close to the tank....
A 13" hoplias aimara COOPED up in that small of a holding tank,.....is bound to want to knock you down when you are close to its tank OR bite you through the glass.....I dont blame it or not at all surprised that your aimara seems so ill-tempered right off the bat.......A buddy of mine purchased a 30 cm orinoco aimara(now,36 cm)about the same time as I did and it seems a bit more content in its present 220 gallon as opposed to my 20 incher in its 120 gal(which i have plans to upgrade to a 270 g soon).....as for shifting it to your bigger tank...try using a SOCK net.....or net it with a regular 12" net WHEN it is in a CALM mood.....I just netted a piece of leftover food from the bottom of my aimara's tank and the aimara shot up and thrashed the small 3" net to shreds,near the water surface of the tank...when he launched at the net.....twice...he slightly,DISLODGED the 30-40 pound sheet of wood that i use to weigh its lid down......Good luck when you net him....cheers.