All your fish have died, the tank is only three months old, and your SPS are dying? No kidding.
To keep SPS, you need a stable tank, older than 3 months if you're new at this, and you need to know Ca, alk, and probably Mg.
You also need to be able to keep fish alive before you can keep corals alive.
What happened to the fish? All die at the same time? Or?
I would say at this point, figure out the fish problem, then let the tank mature as you practice keeping it stable (measured by maintaining levels on the three parameters above in addition to PO4 and NO3).
Once you've got that, then think about corals...
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Brad
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