Had to change out my old substrate from black blasting sand to PFS. My male here is a little over 5 inches he was looking drabbed and stressed out from the constant black sand. He now looks normal and looks awesome with the PFS. I want to say I had him since April as he's the last from a group of 1.5 inch Cubans I tried to get a pair from and it just didn't work out. Found cubans to be a bit slow on growth when small but has been growing noticeably fast for me.