i think you are referring to it as a food source. you have to have something that eats algae in order for it to be consumed. we don't even know what livestock he's got in the tank. you also have to evaluate the tank itself. will it benefit from some marine plants growing in it?
as i said earlier, if they are absorbing nutrients and then you are pruning them back it might be a benefit, but my question would be in a nano (small tank), why would you want to take up precious space with algae?
the rest of us are fighting continuously to keep algae out of the tank.