I have a 40 gallon water tank like for horses that I use for the ducks instead. I also added a BIG rubber tub to the run that they can swim in too. The thing is I have two ducks that share this space and I am thinking of getting one more duck. Would this be too crowded in the water? Will they all want to be in the same water instead of splitting up between the two? AND do ducks have the same hierarchy pecking order the same way chickens do? I am sure to an extent they do but I was wondering in terms of only introducing just one duck to two if that would cause them to gang up on the new one. I know so many questions but i was hoping to get a over view of the situation explained to me so I can make a better decision. ANY info or opinions please. I know the size of the pen will play a part in it but I can't seem to recall how large it is. I am almost positive that it is 12 by 12. What do ya'll think of that size?