How to Get Rid of Aquarium Algae: Green Water, Brown Algae, Hair Algae & More
Few things are more frustrating than walking up to your tank and finding the glass coated green, the water tinted like pea soup, or stringy strands waving from your plants. Algae is the single most common headache aquarium keepers face, and here in Cheyenne’s dry, hard-water climate it can show up faster than you’d expect. The good news: algae is almost always a signal, not a disease. Once you understand what each type is telling you, it becomes very controllable. Here’s how to identify and beat the most common kinds.
Why Algae Grows in the First Place
Algae needs three things to thrive: light, nutrients, and time. When any of those is out of balance — too many hours of light, excess fish waste, leftover food, or infrequent maintenance — algae takes advantage. The fix is rarely a single product; it’s usually a small adjustment to your routine plus the right cleanup tools and tank inhabitants. Testing your water with a reliable liquid test kit is the best first step, since high nitrates and phosphates are the fuel behind most outbreaks.
Green Water (Free-Floating Algae Bloom)
Green water is a bloom of microscopic algae suspended in the water column, often turning a tank cloudy green almost overnight. It’s usually triggered by too much light — especially direct sunlight from a nearby window — combined with high nutrients. To clear it, cut your photoperiod to 6–8 hours with a timer, move the tank out of direct sun, and do a series of water changes. A quality aquarium light with a built-in timer makes controlling your light schedule effortless. Live aquarium plants also outcompete green water for nutrients, starving the bloom over time.
Brown Algae (Diatoms)
That dusty brown film coating glass, gravel, and decorations in a newer tank is diatoms, fueled by silicates and excess nutrients in an immature system. It’s extremely common in the first few months and usually fades on its own as the tank matures. You can speed things along by wiping the glass with an algae scraper and adding cleanup crew that grazes on it. Otocinclus catfish are champion diatom eaters, and nerite snails will polish brown film off glass and hardscape beautifully.
Hair Algae and String Algae
Hair algae forms soft green strands that cling to plants, decor, and equipment, and it usually points to a nutrient imbalance — often too much light paired with inconsistent fertilizer dosing in a planted tank. Manually remove what you can by twirling it around a toothbrush, then tighten up your routine. In planted setups, dosing a balanced all-in-one fertilizer consistently actually helps, because healthy, fast-growing plants outcompete the algae for nutrients. For grazing power, Amano shrimp are the gold standard — a small group will tear through hair and string algae that most fish ignore.
How to Prevent Algae Long-Term
Beating algae once is good; keeping it gone is better. Run your lights on a timer for 6–8 hours a day and avoid placing the tank in direct sunlight. Don’t overfeed — uneaten food rots into the exact nutrients algae loves. Stay on top of weekly water changes and filter maintenance, and test regularly so you catch rising nitrates and phosphates early. Finally, keep a working algae cleanup crew of snails, otocinclus, and shrimp, and grow plenty of live plants to soak up excess nutrients. Balance, not chemicals, is what keeps a tank clear.
Stuck With Algae? Visit Us in Cheyenne
If you’ve tried everything and the algae keeps coming back, bring us a water sample or a photo and let us help you pinpoint the cause. At Tropical Treasures Wyo in Cheyenne, we carry the scrapers, lights, fertilizers, test kits, plants, and algae-eating critters you need to win the battle for good — and we’re always happy to talk through your specific tank. Stop in and let’s get your water crystal clear.