I heard of people using shotgun wads.  CPR sells something that looks like
Easter grass.  Toys R Us probably has interlocking "bristle blocks" similar
to bio balls.

I wouldn't use Legos - would trap water if upside down

You wont have ammonia problems, a trickle filter is very good at processing
this to nitrate.  You will need to do water changes to keep you nitrates
under control.

"Moose"  wrote in message
news:Xns92F8BDCD55164Anonomoosehotmailcom{at}24.71.223.159...
> When making a trickle filter and sump for a series of freshwater tanks,
> what is the best algae growing medium, and what will be good enough? I've
> looked at bioballs, but they're really expensive. I've heard lego
> suggested, or nylon netting bunched up. Today at a LFS one of the staff
> suggested that I use filter inserts (just the big white fuzzy things).
>
> Any noted advantages or disadvantages to any of these?
> Will bioballs really contribute to amonia and nitrate spikes?
> Anything else I should take into consideration?
> TIA
>
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