How long has your tank been set up?
When did you introduce the acros or they grew from frags?
Doesn't look like a lot of rock in the display, could this be happening because of a lack of nutrients/bacteria?
If they only started dying when you changed your t5 to led it is a possibility that it was the light but even usually if it's the light it takes a bit of time i.e. Bleaching, stn.
Did you check to see if predatation is a factor?
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90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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