My tank is like 7 month old, got maybe all algae possible. First 'got diatoms, the brown patches. Will clear with time. After that 'got long hair algae, brown or green. Uncool algae. Then green spot. Hard to clear the glasses. Still have some, but it's fading. My tap water contains phosphates. I switched to RO/DI and it's slowly disapearing. Same thing for cyano. Had some but now only a small section of my tank has a little bit. I have 11 snails, and it's ok for my 55 gallons. Don't wanna add too much 'cause they could die of starvation. The best cleaners are nassarius, but they're small. They tend to prefer the glasses, unlike the others except for a enormous turbo snail. Avoid turbos if your corals/rocks are fragile. For their efficiency and size, the best deal i think are astreas. They work night and days.