Mulm and Humus/Substrate Additives
According to an article by Jim Kelly (who may still be lurking on this
list even now) humus should make a an excellent substrate additive.
Humus is the end product of the decomposition of biological materials.
According to Kelly it has a high cation exchange coefficient (CEC),
meaning the ability to hold onto nutrient cations and give them up to
When I do water changes I siphon mulm and other muck from the bottom,
then just pitch the whole mess out into the garden. This stuff should
be equivalent to humus, or nearly so. Has anyone thought of saving
this stuff and accumulating enough of it to add to the substrate of a
new tank? If I save it into a bucket and let it accumulate and
settle, the decomposition process should go to completion after a
while. Then it could be mixed into the lower layer of a new substrate
What do y'all think?
Bob_Hoesch at fws_gov