We just got some Aquascaping rocks in stock! You can see all the sizes here but what might interest you is the low price of our smaller pieces (3-5cm) of pine rock for just $1 each. I'd suggest getting 3-5 with a single larger piece as your "centre piece" for an awesome aquascape.
Pine rock is characterized by its many cavities along the stone giving it its distinctive look. Its shape makes it great for shrimp and small fish alike which love to hide in its cracks, but also just make it look great. It is also lighter than many other rocks due to these holes, reducing its mass.
Pine rock is also a fairly innert stone, and won't affect your water parrameters.
Thank you!
Postage is coming up as $11 for me