Yeah awesome tank!!!
Landscaping your tank becomes better as the months go by, and yes you will have to rearrange the rocks a bazillion times before you get the look just right. I spent 2 hours last night fussing with my set up for my sea horse tank, and I still didn't get a set up I liked. I decided to leave the tank alone cause my 2 clown fish had had enough of me mucking up their house! Chloe, the female, was getting irritated enough that she started to nip at my hands.
When I first started I got ideas from pictures of reefs. I found that to be really helpful.
As for the rocks that your eel has chosen for a home, I rearange my snowflake eel tank several times; but a word of caution: the snowflakes need time to resettle in the new design, so make sure the lid is closed tight, so the eel won't jump out while in search for a new cubby hole!
Look forward to seeing pics!!