I killed one of Red Corals sea hares!

[legendboy]

No Idea how I did it

I did a 10% WC before I went to get it.

Brought the thing home and acclimated it for about 45 mins.

I floated the bag for around 20 mins and then started to add small amounts of tank water.

I checked all my water parameters and everything checked out perfect. My KH and CA are a bit low. Salinity a bit on the low side at 1.024.

Does anybody have any ideas what I might have done or what happened?? I feel pretty bad and definitely embarrassed lol