GENERAL GUIDELINES FOR 4-5 cm/2″ SAND DEPTH IN 90-100cm/3-3,2 FT LONG AQUARIUM Gravel is dry, clean and ready for use and does not require rinsing. Suitable for Tanganyika, Malawi and all types of aquariums in general. Sand with natural ph that will not alter your water chemistry. This substrate ensures very good rooting and rapid growth as well as attractive appearance of plants. GRANULATION 2-3mm Chemical composition: SiO2 – 99.571% Please do not judge the sand colour while it is in the bag. The sand may have a light shade of grey colour it will look different and much more attractive when illuminated in the aquarium. Our sand is not artificially coloured! It is one of the whitest silica sand found in nature! It is 100% natural and 100% safe! You can rely on our experience!