I had the same experience with SPS on my 12G--I just don't think I could get water chemistry stable enough in such a small tank. The nano was my first tank too, so the challenge of a smaller aquarium + being a relative newbie to marine did not set me up for success with SPS.Thank you! I have some struggle with introducing basic SPS and LPS. All seem to be okay and three four weeks later they suffer... I checked the water and parameters are same... Need to dig into it a bit deeper.