Thank you Robbie! The galaxies are probably one of my all time favourites! Great characters and really beautiful fish! Any substrate will take the same amount. The Shirakura is great, maybe a little bit lighter than Amazonia and it is inert, but keeps the water crystal clear from day one. I have bought mine from Germany if I remember correct it was in 2011 and I am still using it. It has been used in at least 5 scapes by now and I am still using it in the Goias nook and in the new wabi kusa. Dried it few times and use it whenever needed. What is the price in the UK?