Do you have that coral under the tetra tank stock lighting? If you do, you are seriously mistaken about what it takes to keep coral. These LEDs are not the right temperature (kelvin rating) 10k-20k, or not nearly strong enough (they are .06w, not 2-3w) and I don't even want to get into describing PAR ratings.
I'd hate to say it, but your LFS
let you down. Plus realize that spawns are a LPS
and not a soft coral.
A half way decent LED
fixture proper for keeping LPS
like this spawn should start around $200. Please re-advise your setup and more importantly, research into saltwater lighting.