Thanks for the replies, guys.
Water test kits - one is Hagen and the other which is only a month or so old is Oceans. I can advise that the numbers did not change (I do not have the numbers with me) as I tested the day I put in the new corals and also the next morning after we found the dead fish. Only readings that were different were 0.3 for nitrite and nitrate. With dead fish in the tank that is not surprising.
As to the sea apples releasing toxins, three shrimp died as well and they are inverts. Not to mention I have a firefish that is fine. Are they immune to sea apple poison?
Quick update: Found a bristle worm so going to get a trap for that this weekend. Also going to set up a bottle trap and see what it comes up with. The firefish did not show his face at all last night. This is the first day since he came out of hiding that I have not seen him. He did not even come out to eat.
I will let you guys know what I come up with, or if anything changes.
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