Staghorn and diatoms. Diatoms are very common with new setups. They go away on their own. Staghorn can be removed by hand but typically appear in low flow areas. You definitely have too much light. ~160W for a 42 gallon tank is overkill. Obviously, would rather look at PAR but chances are, you got too much light. CO2 at 1 bps is pretty low, see how far you can push it but do so slowly. Also do like 3-4 WC weekly for the next 3 weeks.