Anyone actually use lava rock as bio media?
I'm seeing a lot of mixed reviews out there. Some people say it's garbage compared to ceramic media, while others say it works like a charm. Some say it gets clogged up quickly, while others say they never had that problem. I haven't seen any conclusive proof one way or the other, and it seems most of the answers I've seen are based completely on assumptions or rumors. Has anyone here actually used it? How did it work out and how much of it did you use?
Also, if I wanted to do an experiment to compare different bio medias, what would be the best method? I'm thinking of setting up a 5 gal bucket with plenty of cycled media in the filter and removing a little bit at a time until it can no longer handle 2ppm or so of ammonia in 24 hours. Then measure how much media is left. It won't be a conclusive test as far as different water volumes and flow rates, but at least it will allow me to get an idea of how two different medias compare.