i have had my 3 clowns in my tank for a few weeks now and 2 seem to have settled down real well but the other one is soo pale as you can see in the pics all my water is checked regular and is fine, i have nothing in the tank i deem as aggressive there are a good number of hidings for them and more will be added, any ideas why hes so pale? he does still come out plenty and seems happy enough its just his colouring

as you can see he out with one of the others and defo not the same colour


any help greatly recieved
Rave