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Aquarium Substrates are used to promote healthy plant growth. It's important to get things right from the start, and this means starting with a nutritious substrate. We've tried and testing all our substrates and soil, so we know they do the trick!
For an all-in-one bottom layer we recommend Tropica Aquarium Soil or Soil Powder. These are complete substrates and do not require capping with gravel.
Tropica Plant Growth Substrate is designed for laying under your chosen gravel/substrate. The choice of which to use is simply down to personal preference.