I was only going with the 5 rows pictured so really if you had 12 rows of these tanks you can fit 108 - space for shelf and a gap to get to the tanks so lets just say 10 shelfs thats still 90 tanks double what you have, not enough room still? 8 shelfs = 72 thats still more, cant reach the center & back tank remove 2 thats 56 tanks more managable less work
If maxium tanks in your space was the aim i think there are better easier ways to go about it im just not sure the spinning will work without getting something tangled up