Thanks Bogie, Well Metz that some set up a 300 gal. Can you tell us about your filtration ( bio balls or filter socks, what ? ) 600 pnds of LR in a 300 gal. tank hmmmmm, that awefully dense rock and must be packed VERY tightly. Can you provide some pics of this beast ? You can make a free account at photobucket.com , and copy and pste here in a post that might help quite a bit.