I kind of call BS that your Aro is a 23". In 15 months, no way could a 2" Silver Aro grow to 23" in a 55g. It looks much smaller than 23", Around 16-18".
x2, that aro isn't 23". lets do the math kids! those are 12" tiles (4 tiles make up length of the 48" 55g), and the aro looks to barely make up the length of 1 and 1/2 tiles. That aro is 18" at most.