ok I thought why do all the work by yourself?
A Virusbot could just insert a virus in the Dna of Algaes make them collect energy, prevent them to reproduce(so energy gets stored and the algae mutations does not kill of everybody) and then let them seek out their "master" and his kind(the virusbot or like I call it the "vampire").
Such a master and slave relation would be created what do you think?