plantbrain

Also, I've read about people adding horticultural Charcoal between soil and cap to further absorb and then release nutrients. Also have read of some people adding peat granules to prevent anoxic problems and buffer ph etc. and was wondering if any ferts or root tabs should be added since my tank will be empty and started from the bottom up.

So I figured on my 75 Gallon about a cubic ft. of soil needed. I got 2lbs of C-Red clay and received today. I thought 2 lbs. would be a larger bag. its fairly small. I don't think I'll have 5-10% clay. Should I get more, or is this enough. Also. How do you gauge how much potash and d0lomite to add to bottom?