I found coot's organic mix and it seems to overlap alot with what you guys suggested so i mixed up the folowing with what i have:
100l
vol%
- 30% peat moss based light mix
- 30% perlite ( will get lava next time )
- 25% compost (12,5% compost, 4% EWC, 2% Bokashi) instead of crab / crustacean...