Hi, my 80L aquarium has cycled!

All the water reading are 0. But there is brown algae growing on everything. I read it was common for newly set aquariums, and that it will dissapear. What should I do now - should I clean the walls, wash the plants (artifitial) and vacume the gravel? Or leave it as it is not to disturb the newly established bacteria collony and brown algae will indeed dissapear all by itself? I have 3 zebras danios at the moment and was planning to add 3 more, once the tank cycled. Should I get an algae eater first to help clean the tank?
Thanks