Thank you sir for the tip and education, I will pick some up this evening. I will research further and figure out where and how to place it in the Biocube (space is limited as you know). Have a great day! Your advice on the biocube is really good, is there anyway to extract that portion of your thread for the other newbies out there? I think it would benefit everyone.The only thing I would suggest is replace the rubble with seed media