Why the hell do my sps keep dying

[o.c.d.]

So I couldn't find where you mentioned the Temp of your tank. High and low or if it is constant. Also are your corals bleaching? or do you notice a brown jelly, white paste? black gooey material? ect..
I ask where you place your new coral and bulb age because of burning. If you get your corals from the same place, that happens to have low light and the tranfer to your tank with bright light, now where in the tank may be safe from burning esp if your tank depth is low and your lights are close to the water. Just a thought.