Overcrowding??? I have a ten gallon tank...?

I'm planning on starting the cycle with 3 zebra danios, then after a month or so adding 2 guppies----I've done my research and it says they grow 1.5 inches (that goes for all 5 fish) and at most they will MAYBE get to be 2 inches......SO, is this too overcrowded for my 10 gallon tank?