From Microcosm Aquarium Explorer
Glosso is one of the tiniest of foreground plants. The low-growing Glosso is often used to carpet the substrate in bright aquaria.
Other common name(s):
Habitat: Marshy and boggy areas.
Maximum height: 2.5 cm (1 in)
Lighting: High to very high.
Water: Freshwater 22 °C (72 °F) - 26 °C (79 °F)
CO2 supplementation increases growth quickly.
pH: mildly acidic; hardness: soft.
The substrate should be fine and nutritious to increase density of the planting.
The higher the light, the more compact the growth with this plant. Lower light levels or shady areas will just cause it to melt. When planting in the aquarium, small bunches of Glosso should be planted deeply at intervals. Even though this is a tiny plant, it has the ability to form a dense carpet where it is planted, provided its need for light and nutrients are fulfilled. It is often planted in craft mesh to get it started so it doesn’t float around the tank. If you see that your Glosso is not performing according to your expectations, look to the lighting and check for overshadowing plants in the midground or background. Also try to set this plant in a CO2 supplemented environment.