White tips on SPS

[Llorgon]

I got a SPS coral last week and all the tips of it seem to now have white tips.

I tested my water and my parameters were
Ammonia - 0
Nitrite - 0
Nitrates - almost 5ppm
pH - 8.2
Phosphates - 0
Alkalinity - 6.4

It's a newer tank. I have some corals, snails and 2 clown fish.

I'm guessing alkalinity might be the issue?

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