My sps is dying?

And i can see now after discussing this how my light might be to bright. The tank is 24" high and I have a 6 inch dsb. And the sps coral is only maybe 8-9 inches under the water
 
What do biopellets do?. Im not familiar with those


This is a topic that requires some reading :)

They are a solid carbon source. Used properly they are a great way of keeping nitrates and phosphates in check. I am a huge fan because they are cheap to run and implement and are extremely effective. Also low maintenance.
 
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