i have 42 gal salt i added a refugium to it 400 gal hr return and kent marine bio sediment 2 inches in the bottom of it . then i let it settle for a week with a air pump, and let it run in the system. i added algae to it the 5 weeks later it was slowly disappering from the sump. now its all gone . why? i bet there are some good people here that can help me figure this out. thanks
