Reality check: algae is normal. The goal is controlled levels, not a sterile tank.
Quick Identification Table
| Algae Type | Typical Appearance | Common Trigger |
|---|---|---|
| Green dust/film | Green layer on glass and leaves | Excess light, immature balance |
| Hair/thread algae | Stringy green strands | Light/nutrient mismatch |
| Black beard algae | Dark fuzzy tufts on edges | Flow/CO2 instability, organics |
| Brown diatoms | Dusty brown coating | Young tank phase, low light balance |
Root-Cause Sequence (Use in Order)
- Reduce photo period to 6-8 hours for 1-2 weeks.
- Improve mechanical cleanup and remove visible algae manually.
- Increase weekly water-change consistency.
- Review feeding and remove trapped debris zones.
- Stabilize plant growth before increasing light again.
Weekly Anti-Algae Routine
- Scrape front/side glass during water change.
- Trim damaged or heavily coated leaves.
- Siphon detritus pockets behind hardscape.
- Keep nitrate in a stable target range (avoid big swings).
- Use a timer so light schedule is identical daily.
What Not to Do
- Do not blackout repeatedly without fixing light and waste balance.
- Do not over-clean bio-media and substrate in the same session.
- Do not dose multiple "algae cures" blindly.
- Do not increase light intensity immediately after initial improvement.
When You Should Intervene Quickly
- Fast-growing black beard algae on plant edges.
- Hair algae smothering new shoots.
- Algae bloom combined with stressed fish behavior.