You Have A Good Variety, But You Are Right That You Need Lots More Rock.
Its The Most Expensive Part Of The Tank (at $10 A Pop At My Lfs It Is!)
You Do Want Lots Of Caves For Swimming In And Out Of, Hiding Spots And Aeration As Well.
You Can Connect Your Rock-i Dont Know How To Do It, But I Now Many People Use A Bonding Material And Also Drill Their Rocks And Tie Them Together With Something.
But If You Build A Wide Base, First, Then Simply Build On Top Of It, In A Pyramid Shape, That Give You Ledges At Each Stage To Set Your Livstock On-at Different Heights. Then Each Level Is Stabilized By The Layer Below It.
Dont Ever Leave A Rock That Is Wobbly Or Can Be Pushed Off-disaster Pending. Just Set Each Rock Firmly On The Rocks Below It-i Used Less Expensive Base Rock And Tufa Rock For The Foundation Which Came Almost To The Glass In Front-just Enough Room For Cleaning-and Then Built Each Level Higher And Higher. Take A Look At The Reef Pics On This Web Site-there Are Some Great Ones-and You Can See How They Are Stacked.
Something You Could Do So You Dont Have To Spend Your Entire Fortune Onlive Rock Right Now, Is Do One Side Of The Tank At A Time-then Just Add To The Other Side As You Go.