hey justin! thought about that too, but the 3 have very different formations... 1 is light bronw and just the tips in purple.....3 you can see it´s full purple, even the base ......4 it´s darker brown with light purple tips, and coralites differ from number 1.....
what a mess....haha
and an important factor, they´re side by side in the tank, so big chances of same flow and lightning
thanks
rodrigo