My hope for the 2" pots was that it would restrict the growth of some plants so they don't get too big. I've only got a 20 gallon tank and don't want plants, especially those on the background to get too large. 3-4" pots might start taking up a lot of space on the background, too. I'm going to give these a shot. I'm going to secure them along the edge of the "ledge", so maybe that will make it look natural.