The 2 smaller ones seem to have the same mystery white patches as my 2 original ponies. "loss of pigmentation". I have never seen such tiny horses in person before. 1 1/2 inches is the smallest and that includes the tail. I named her thumbalina. (if infact it's a female, lol.) They all look like females right now.

(I ordered from this vendor because I was told that is where my original 2 sea horses came from. I have read that it's not a good idea to mix horses from different vendors)