Planted Tank Enthusiast
Join Date: Jul 2014
Location: California for school, Arkansas for home
I don't think that bloodworms will work...they're the aquatic larvae of midges, so eventually, they would metamorphose into midges, something I don't think you would want in the house.
As for the UGF, this does sound promising, but from my basic understanding of how UGF's work, your idea might be flawed. Different parts of the substrate would build up higher levels of soil throughout, and since water flows through the least resistive path, you would end up with anoxic conditions in some parts...