Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
If your city treats the water with chlorine, chloramine, ultra violet or other sterilizer the algae is likely dead, and filtered out. The remaining taste (or smell) is not enough to make algae grow in your tank.
However, if the water had changed in other ways (mineral content, other) then that might alter how your plants are growing, and this might invite algae to grow. Not because it came in with the water, but because it was there all along, but the plants were out growing it.