We're finalizing some ideas for our other two tanks and wondered how many angels would be comfortable in each size and which they would prefer. I know they like taller tanks, and the 40 breeder is only 16 inches tall where the 37 is 22 inches, but I was curious about opinions on that. We also wanted to know if there is enough room for a pair in a 37 gallon. If so, its best to get 4 to 6 small ones and see who pairs up? Only problem is how do you make sure you don't get attached to the others ?! LOL So in short, how many would be comfortable in a 37 and how many in a 40 breeder?