The added information helps. Since you have had the pool for 5 years, it is well-established and the Spring blooms are pretty normal. From your picture, I wasn't sure, but I thought it might be the typical green algae that clings to everything, but apparently it isn't. I wonder if you need to increase the aqua-garden area? Additional plants would take in more nutrients that are used by the algae. I am going to send you a PM with some info.