This is one of the original complete substrates and has been around for many years. It made from porous clay gravel and is particularly rich in Iron but also contains some other trace elements, as well as Magnesium and Potassium. The texture is quite sharp so may be unsuitable for fish with sensitive barbels i.e. Corydorus. The brown/red colouration may not suit all tastes. Grain size is around 2-5mm. It can be mixed with plain gravels for less expense.
Pros
- Nutrient-rich in Iron and other important elements
- Proven track record with lots of planted tank owners
- Does not affect water chemistry
- Can be mixed with plain gravels
Cons
- Sharp textures may not suit some fish
Details
| Size | 2-5 mm |
| Color | Black, Brown, Red |
| Material | Substrate |