One more thing I'd like to add Ramen is that you go with your gut instinct on this one, you're the one that's going to enjoy it everyday. When i first started my GLA 6g, and i took a picture of just the yamaya stone, people were telling me (in the AA forum) that my stones were too sparse and small, to add more or larger ones. I decided to ignore the recommendations and go with my own vision. Now that it's put together, i get tons of compliments, which i greatly appreciate because it validates my risk as a job well done... My tank still has a ways to go because it's still sporting the ugly Fluval pipes (hence my want for your lily pipes).
So for the small fish, won't you need a heater for them? I decided to get CPD's after my soon to be acquired red rili shrimp come in.