The queen angel is still alive this morning so i'm crossing my fingers it will pull through. Still lying to one side but still breathing.
From all accounts, i believe it is h2s poisoning. The bucket of rocks were smelling like rotten eggs which was why I wanted to do the water change. Two pieces of rocks in 300g of water was all it took to kill off five fishes. Seems very localized in that the side of the sump that the rocks were in killed 4 fishes. 8 years in this hobby and I didn't even know about this h2s poisoning so folks, learn from my mistake -
DON'T PUT ROTTEN EGG SMELLING ROCKS INTO YOUR TANKS NO MATTER
HOW MUCH WATER FLOW OR HOW BIG OF A SKIMMER YOU GOT
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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