Well about 3 weeks ago or so I started running a reactor for phosban. I think its helping but am not sure. What does algae look like as its dieing. Ive notice long string strands of red algae all of a sudden on my sand bed and foam structure in the tank. Is this dieing algae from running phosban or a whole new problem. Its not thick like cyno which grows thick usually, just several long then strand blowing around in the flow of the tank. My fuge has none of this, only the main display.