Hello Plastic Reefer.
What is called for here is a vacuum cleaner.
J/K!!!!!!! It appears that you have a nuisance red algae. There is always "cause and effect" so what you need to do here is find out what is causing this wildfire of algae to take off and grow rapidly. Algaes require a "food source/nutrients and light to grow. I myself, am not keen on adding chemicals to my tank to make corrections. What are your water parameters and how often are you doing water changes? What type of flow do you have in your tank? I would syphon as much of the aglae and clean the tank as best you could to remove it. I would also make sure that good water flow is directed in those areas of heavy growth. I will respond further when more details are supplied.
Using chemicals may be a "quick fix" to eliminate a problem, but unless you correct the problem at it's source, you will continue to do battle with this algae.
