Disaster!

[daniella3d]

I don't think it was the exposition to air as well. I take a long time to do my water change because I refill with bucket from my basement so it takes me 40 minutes minimum and during this time I shut down my heater (to prevent overheating and cracking) and I leave the T5 on.

I never had a problem with any of my SPS doing this. It does smell very strong, and they often produce mucus but they are just fine one hour later.