As the algae is removed there will be less algae to consume nitrates, phosphates and carbon dioxide. As a result your nitrates will go up and possibly the ph drop. the best solution is to add plant life you desire to consume the nitrates feeding the algae. that way you have pretty plants not the ugly algaes.
I agree that this is a great way to get rid of your algae problem, however, rather than the main tank as he suggests, I feel that lots of plants are better kept in the refugium or the sump. They still do their job there, but they keep your tank looking more like a reef than a lagoon. But, it's all up to what you prefer...