Just had a member follow up on using a black out and he's happy.
Chemicals work and at about 1/3 less than needed for treating fish but it can be done chemical free.
The Fraternity of Dirt
If at first you don't succeed,,, keep kicking it
2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g,
2012 update adding table top pleco pans & a 90g (Nutz)