Akadama grading 101
After reading that Akadama soil can be used as a reasonably good substrate here:
LINKY and being as I have a few bags knocking around that I use in bonsai, I thought "hey why not give it a go". Although it is a cheap substrate it should be noted that it will take a lot of work (approx 4 hours) to prep ready for going in the tank.
Akadama is fantastic in bonsai as it is porous whilst also free draining. It apparently has a good CEC which allows it to lock in nutrients for the roots. Sounds great for substrate. A bag of Akadama contains pieces from dust up to 8mm in size. We grade the contents to remove the "fines" and get different graded pea sizes. Fines are removed as they will clog up the free draining nature of the soil. I can only assume the same would be true for water movement through it when used as a substrate...
For grading I use a sieve set like this:
LINKY
Pics numbered to save on post length:
1. Sieving station set up
2. The fines to be disposed of
3. The free dried roots that also come in Akadama
also to be disposed of
4. Resulting graded Akadama after 2 hours sieving
5. Second round - rinsing more dust off
6. Third round "floating" more roots off
7. 1/2 bucket of the good stuff
8. Done!
I will be using the second from the left pea size in pic 4 above (approx 2-3mm) as it should make a nice fine planting medium for roots to go bonkers in.
I'm thinking that as the Akadama is a dark rust colour when wet, some similar coloured rocks would look cool and give a nice contrast to the green of plants - now off to find em