OK, I know this is a really dumb question but what is an Iwagumi aquarium??????????
No question is dumb (:
Iwagumi is based on a Japanese term for collecting rocks or stones. It's literally means rock formation. It typically deals with an arrangement of three rocks; one main and two subordinates. The tank has a very simple yet relaxing look to it.
Of course it really doesn't mean you have
to use three rocks. I've seen many tank that have more and still look amazing. Hope this helped (:
The tank looks awesome so far. I'm super jealous of that UG farm you have going on there!