Yes it is long but a fun read if you have the time . If I remember right the experiment showed that most anything can be bio material and handle high levels of ammonia , even the sides of a bare glass tank . I mmortal1 can tell more than I . I need to reread it myself .
OK. Coincidentally, there is a discussion about this going on at https://www.plantedtank.net/forums/8...l#post11385895
. I did see part of it where @Immortal1
seemed to have found that pumice was significantly better than Matrix, but that may have been an early result.
I just received an order of MarinePure media that was recommended by @Edward
for de-ntrification. I opted for the 1.5” spheres. They are more like pumice than either the Matrix or Biohome Ultimate. I cut all three in half and the Matrix and Biohome appear to have very little, if any, visible porosity in their centers. However, the MarinePure has the same apparent porosity throughout, as is evident on their surface.
In my case, I am more interested in them for anaerobic BB activity, but their surfaces will certainly develop aerobic BB. I would expect that both the Matrix and Biohome would be better for aerobic activity pound-for-pound simply because they are smaller (which adds up to more surface area). However, as you may see if you look at the other site I just mentioned, I’m not sure that there is really that much necessary aerobic BB activity anyway. I’m going to string these spheres together, like popcorn on a string (a long needle will penetrate them), and hang them in the back corner of the tank, behind the plants, rather than putting them in the filter. I may even bury some of them 1/2-3/4 into the substrate.