Lava Rock

[fishman256]

Hello,

I have heard that lava rock can filter the aquarium water. Please can anyone tell me if this is the case and if so how it does this?

 

[FSM]

Yes, you can use it as biomedia if you bash it up into pieces and put it in your filter. However, it has very low surface area compared to just about any other media, so it is pretty worthless IMO.