[Tammy3770]

I cane across some aquacultured fiji and picked up different shapes like an X and an O there were many ready made cave rocks in that pile they were pretty cool but it took a pretty big rock to make a nice sized cave and at 6.00$ a Lb !!

bu I actually have a 34lb chunk of tonga that is sphere shaped and hollow in the middle with 4 "cave entrances" in to the middle

really cool.

the best thing you can do is get a list of all LFS in a 50 mile radius and go shopping everyweekend for a month
I spent like 3 hours in each store digging through every piece of rock they had.

and try to visit each store at least 3 times in that month.

IMO its the best thing to do if your just setting yo your tank
You'd hate to look at ugly rock forever in your nice tank