Tanks about 6 months old. 29 gal. 2 small fish, emerald crab, a few snails. Lights on on 8.5 hr cycle. Kessil light that I run mostly blue. I feed once daily very sparingly. Use long pipets to spot feed fish so very little waste. Nitrate say between 5-10. I have a Hannah phosphorus ulr and always read zero since adding gfo in reactor. Was running a fuge with cheato but gfo killed that off. I manually pull out as much of the algae as I can during my weekly 4.5 gallon water changes. Algae has not completely taken over but it is slowly getting worse along with red slime cyano which I blow off with blaster weekly. I have increased flow. Looking for advice on how to get rid of it. Urchin or sea hare? Black out tank? What have you done? Thanks!