The term ‘carpets’ are usually applied to shorter plants that spread across the soil surface using runners. The shorter, finer carpets usually require CO2 to grow well. Because they are small and grow at the substrate level, they tend to be furthest away from the light source and most of them spread faster and grow shorter/denser when there is stronger lighting. Many root better in finer substrates. Most carpets spread quite quickly through runners if conditions are good.

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