Medium care plants sit between the easy plants and the high tech ones. Most want moderate to strong light, regular fertilizer and stable water, and they look better with CO2 even when they don't strictly need it. This group includes several Rotala, Bacopa, Cabomba and Lagenandra, plus Dwarf Baby Tears and Cardamine. If you've kept anubias and java fern without trouble and want more color and growth, this is the next step. Everything is grown fully submerged, or labeled emersed, so you know what you're getting.