I doubt that there is anything in the base to screw up! Just might screw up the clamp but thats the least of your worries! The light itself is the expensive part.
And for the pump pic, I have the same redish brown stuff on mine also. Its been on it since the tsank has cycled, Most of it turned into algae or soemthing since its right at the front of the fand and I see it blowing. The other stuff looks like its turning into coraline now. But I dont know what it is forsure, just hasnt messed up my tank yet!