Tuffa Rock

[SkiFletch]

Some lava rock will cause water quality problems by dissolving nasty chemicals into your water. Its structure also does not easily harbor bacteria for the nitrogen cycle and it becomes a magnet for algae... I wouldnt use it

 

[boshank23]

Lava rock is not a good option. Cant really tell you why that is, but wanted to answer your question quickly before you went that route. I asked a million people about it since I can get it for super cheap. I think something to do with it dissolving over time or creating a water quality issue.

Sorry I couldnt be more spacific. Hopefully some else can expand on the reasons for ya!

i wasn't planning on using it myself, just wondered if it could be a chepa alternative.