Duckweed

Fair warning: duckweed multiplies. It's one of the fastest-growing plants in the hobby and will cover your surface in a matter of days. That's actually the point, it absorbs nutrients at a remarkable rate, reduces algae, and diffuses surface light beautifully.

Just don't say we didn't warn you.

Sold as a 2oz portion.

Care at a glance:

• Light: Low–High
• CO2: Not required
• Growth rate: Extremely fast
• Placement: Surface floating
• Difficulty: Very easy