i have the same type stones i used for this scape. and a few more that are similar, but smaller. this tank is a 5.5g standard. i can see what i can find and get pics for you if your interested. let me know if you like them. im sure youll be able to do much better with them than i would!
The tank i am using is actually a fluval chi that I have had for a while and decided to make a high tech nano scape out of it. the dimensions are 10x10x12 and I am thinking for more of one big rock near the back with 2 smaller ones around the front. any ideas / tips would be greatly appreciated!