One of our favorite plants, java fern, is great for most tanks. These mats come in 2 sizes. 

Common Name: Java Fern
Family Name: Polypodiaceae
Native To: Asia
Lighting: Low
pH: 5-8
Growth Demands: Easy 
Growth Form: Rosette
Growth Rate: Slow
True Aquatic: Yes
Placement in Tank: Mid-ground
Available As: Bare Root and mat