Strange Behavior
I added about 20 pounds of rock to my tank 2 days ago. The rock had been curing for a few months in a holding tank by my LFS. Last night I noticed my dwarf flame angel swimming up and down in one corner. He had been living in another set of rocks that hadn't been disturbed. Today I found a banggai cardinal dead. All the other fish are doing fine, including a regal angel and multiple butterflies. I figure they are more delicate and sensitive fish and if they're doing ok, everything should be fine.
Anything to be worried about?
Thanks
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