I have them too. I purchased a 2 polyp frag at a LFS the last week in April-first week of May and as of today (6-29-09) pretty close to 2 month period, I now have 6 polyps. I have them under 250wt MH in my frag tank. The Ding Dangs,I'm guessing is setting about 2 to 2 1/2" under the water and the light is about 30" off the top surface and dose Vit.C which I swear by. Soooo with that said and your set up, I would place them high with them being under only 130wt PC's,low lower than mid way down.Thats my opinion/suggestion. Good Luck and enjoy....there one cool looking zoo.