find out what kind of substrate it is first, 80lbs in a 75 is barely enough, you will probably want to go with an additional 60 lbs. as for the rock, time for more research, I will say this, avoid gulf aquacultured rock, it's heavy, dense, and not all that porous when it comes to bio filteration. Fuji, totoka, galeani(sp?) are all good types of rock. Have you read through this sticky?
Click here before you ask, (links to answers)
If you haven't now would be a good time to start, alot of your questions can be answered right there, and you will also learn alot of good things to help you out as you move forward.



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