Tank: 60x24x24- I am going to purchase the Solaris 48" H4. I am currently running (2) 48" Coralife Lunar Aqualights, They are 9" above the water (orig. set at 18" above the water by person who set up my tank). I have a large (12' not including the mantle) Squamosa clam at the top, LPS, a couple of SPS, leathers and shrooms. Has anyone had experience with changing over their light source, especially to LEDs? The clam especially concerns me- I have had it at least 3 years- since babyhood! Thank you for any input. Dawn.