Amazon Frogbit
Ideal size: leaves 1-3cm. Roots hang 5-10cm below for fry hiding. Grows fast but controllable.
Need surface agitation below 1 — strong flow sinks leaves and rots them.
Water Lettuce
Larger rosette (5-10cm). Excellent fry cover. Looks like tiny heads of lettuce floating.
Sensitive to high temperature (over 30°C) and strong lighting. Can burn under high-tech LEDs.
Duckweed
Tiny floating plant that spreads aggressively. Covers surface within days.
Use with caution — hard to remove completely. Some keepers intentionally grow as chicken feed or shrimp food.
Control Techniques
Fence off a surface area with airline tubing clip to keep floating plants in one zone. Prevents full tank coverage.
Remove 50% weekly in established tanks. Compost or give to chickens/ducks.