Zoas and GPS not doing so well

[marine_world]

So I acquired a nano reef (been set up for about a year) with about 5 bubble tip anenomes, 2x clowns, fire shrimp, anenomes crab and 3 red leg hermits and 3 nice pieces of live rock. I bought a couple small frags of GPS and 2 frags of zoas (5 polyps in total) when they were put in they were doing well then all of a sudden all the frags all closed up and now the zoas are dead! Anenomes, crabs and fish are all thriving. According to my API test kits, My ammonia is 0.25, ph is 7.8 - 8.0 can't really tell exactly nitrite 0, nitrate 10, and my kh is 8. Using a spectra light unit the one with 3 sets of 3 led lights including a purple led and a fan. Does anyone have any ideas why the frags are not doing well and dying?

 

[Gumbies R Us]

Bumping your post!