Centipede turning red means it is potassium deficient. Better read the bag before you spread anything on that grass. Many fertilizers have potassium chloride as the potassium source and that is toxic to centipede. Even more so on clay or loam soils.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738