Iwagumi. I like the idea of bunching the rock into a back corner. A lot of aquarium real estate is under utilized in the corners, normally.
Look at this Pure Garden Stone Waterfall Fountain on #zulily today!
Handmade by Mini Rock World
Ellie-Bo Rock Formation Handpainted Polyresin Aquarium Ornament, 30 x 14.5 x 18 cm: Amazon.co.uk: Pet Supplies
Top Fin? Mountain Cliff with Waterfall Adorn your aquarium with this beautiful air bubble waterfall. $28.99 Style # 2297066A
Sloping Mountain & Cave Ornament 7.5 in. x 3.5 in. x 4.5 in.
Cascata ruscello per presepe 25x29x29 cm
Vitality AF135 Aquarium Decorating Cave Ornament Vitality http://www.amazon.com/dp/B00JL9185C/ref=cm_sw_r_pi_dp_UD9gwb1DC2EC6
Look at this Stone Pond & Bridge Figurine Set on #zulily today!