>  CS> Well we did the initial steps to get the 70G tank going.  Got 
 >  CS> some water cure stuff and some new gravel.  Not quite enough 
 >  CS> gravel yet but wasnt sure how much I would need.
 > 
 > the rule, on gravel, that i always use is one pound of gravel per
 > gallon of water... i believe this is what is called for with 
 > undergravel filters but i use it all the time...

 CS> Umm, 70 lbs of gravel?  Dont think so!

why not? you already have 585 pounds of water... what's another 70 pounds
of gravel going to do?

FWIW: a gallon of water weighs 8.345 pounds...

back to the substrate/gravel... you should have at least 2 to 2.5 inches of
substrate... that's about 10 pounds for each 150 square inches of tank
surface...

)\/(ark