Join Date: Nov 2010
Location: White Plains, MD
I personally believe that fish schooling in a 20g is sort of difficult. In larger tanks, maybe even a 29g, fish have more room to move through the tank and get away from each other and likely stay closer because of that. In a 20g, maybe less in a 20 long, fish can move from one end of the other without losing sight of each other and stay loser. Just my observations of some fish.
The schooling is definitely more noticeable in tanks like 75+.