I used 6 bags of regular flourite for my 50 gal, and got about an average of 3.5 to 4" coverage. You might need one more bag. Or just use regular gravel to make up the difference. With 8 bags, you probably got enough Flourite already as far as the plants are concerned. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.