Efficient O2 producers?

[comebashme]

Any recommendations on plants that are good at producing lots of oxygen and yet looks nice? Looking for mid and foreground plants... Currently have a lot of Cabomba (green and red) and Issoetes japonica (I think).

[juggler]

Riccia is one such plant. The pearls of O2 bubbles are nice but not sure if you like them in the tank. Can be troublesome to maintain.

[|squee|]

Glosso bubbled like crazy for me under high light. Java fern also bubble.

[ranmasatome]

You can try MM. very easy to scape also..