Things You'll Need
- Aquarium
- Aquarium net
Instructions
Purchase duckweed from a local fish store or online retailer. Most shops or sites that sell aquarium plants will have some for sale. You can also buy duckweed at an auction sponsored by a local aquarium club. Some friendly hobbyists may even give the duckweed to you for free just to get rid of it.
Place the duckweed in a 10- to 20-gallon freshwater tank without fish. Turn the tank light on for 12 hours to mimic a natural light cycle. Change the tank water at least once a week to replenish nutrients for the duckweed to grow.
Collect the duckweed with an aquarium net. Dip the net into the water and move it to gather a baseball-sized clump.
Transfer the collected duckweed to your aquarium with the tilapia.