A little rusty after 8yrs. Well I decided to use great stuff black can for 1" gaps along with the regular version. I forgot how much this stuff expands. Buried in the corner is a siphon pipe and big piece of driftwood. Buried in the middle is my pvc for fogger. I foresee A LOT of carving and sculpting in my future. We got a laugh out of it.

Those were root designs to the right if that tells you anything.