Home / Soil and Substrate Categories Aquarium Soil Gravel/Sand Substrate Additives Substrate Bottom Layer Soil and Substrate Home > Soil and Substrate 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, Dennerle Scaper's Soil or ADA Soil. These are complete bottom layers 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. Substrate additives are used to promote a healthy substrate environment, perfect if you want the best start possible. Aquarium Soil Gravel/Sand Substrate Additives Substrate Bottom Layer Sort by: Most Popular Latest InPrice Low to HighPrice High to LowName A to ZName Z to A View Showing 1 - 2 of 2 products Showing 1 - 2 of 2 products Item in Stock WIO PowerVol Base 5kg 0 review(s) Add to cart Quickview WIO PowerVol Base 5kg 0 review(s) £17.99 Volcanic natural bottom layer substrate. Add to cart Quickview Item in Stock WIO PowerVol Base 2kg 0 review(s) Add to cart Quickview WIO PowerVol Base 2kg 0 review(s) £8.99 Volcanic natural bottom layer substrate. Add to cart Quickview