By help, do you mean help the algae to grow?
Assuming that is not the case and that you prefer to discourage the algae, then by all means do not fertilize...in my experience, you will make the problem worse, much worse possibly.
Some of the pond management publications actually recommend fertilizing to get rid of weeds and algae under the theory that by fertilizing, you foster plankton blooms which makes the water green and in turn allows less sunlight penetration which in turn (in theory) gets rid of algae and weeds...a miracle..only it was a disaster for me. It was a miracle of explosive weed growth and algae mats so thick you could walk across the pond. What the theory fails to account for is that existing weeds and algae can and do utilize the fertilizer quicker than the plankton can generate enough shade to stop them...at least that is what happened to me. Some say well you didn't fertilize enough, some say well you fertilized too much...the point is that fertilizing a pond with existing weeds and algae is at best a high risk situation, and at worst a disaster waiting to happen.
I don't pay much attention to those publications anymore.