I've changed most of my filter sponges over to Poret foam. It lasts almost forever. You could use a piece of the 30ppi instead of the filter floss and it will increase the surface area for BB by a lot.
You got my attention with this, so I contacted them about making a tank divider for my 40 gallon with this stuff. I bought one from Pet Smart and it is horrible. It is deep enough, but is too short by 2 or so inches from the top and the clips are horrible.
The divider would be for emergencies only, and it would certainly be better than the useless POS I bought and can't use.
Thanks for mentioning it. I would have never thought to use foam for a temporary problem.