My system has been up and running for closet o 2 years now. Over the past 30 days I have had a huge increase in Asternia starfish in one of my 150 gallon tanks. Do I need to be concerned? At night I currently have about 30 or so on my front glass which quickly leave when the lights come on? This occurred all of a sudden and I am wondering if I need to manually remove them, or if they will come and go and just let it be? Any advice would be appreciated.