Welcom BodyofH20!
Wow, thats a lot of livestock for such a small nano. Mine is 20g with 10 hermits, 10 turbo snails, 1 tile starfish, 2 percula clowns, and 2 yellow gobies. About 30lbs lr, 1.5" sand bed. RBTA (temporary until it gets to big), shrooms, zoas, green favia(small grape fruit size) frags of kenya tree, candy cane & pink tip frogspawn, will probably add more frags. But only 1 more fish a small one 4 Line wrasse. We don't like to use crushed coral for substrate, it tends to hold nasty stuff that it then releases back into your tank.
That should sort of give you an idea for comparison to your 12g which is almost half the size of my 20g.
Please give us some more details on your set up, as well as para.
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