Good Bacteria

[lgn1966]

Can lava rock be used in a filter for the good bacteria to live in ?

 

[Geoff-]

I don't think it's porous in which case I'm sure you could do better.

 

[doresy]

This stuff is great......cheap too!



http/www.aquarium-parts.co.uk/acatalog/Ceramisub_Bio_Media.html

 

[Joshwainwright]

I've got two trays of that stuff in my external!

(The ceramic stuff that is.)