I was in a hydroponics store recently and saw a very large bag of small round pebbles that looked very much like akadama - It even had a red color similar to akadama. It is called hydroton. It is a high fired clay that is used as a growth medium in hydroponics. It does not decompose in water either. The research I have done on hydroton says that it is made in Germany and some people have said they use it in place of akadama in their bonsai soil mixes. Has this been around for some time and I am just finding out about it now or is it something new ?