Nice start! I like your rock work.
I cycled my Fluval 13.5 with Turbo 900 and highly recommend it (tested 0 Ammonia, 0 Nitrite, 10 Nitrates first week). I just added a second Koralia 240 as one wasn't cutting it and started getting Cyano in places.
I use a sock of carbon and a Chemipure Elite in the 2nd chamber. When the Chemipure is up for replacement I'm thinking switching to a sock of GFO. I run floss at the top of the same chamber. In the first chamber I have the Fluval SAE Skimmer as it came with deal from my LFS. I have it dialed in and really like it. Worth it? Not sure. But, do like it on my system. Chamber three I just have the return pump and slim heater that fits next to it.
I love the tank. It is my first nano and it is certainly a different ball game from larger tanks. It's fun!