I am new at all of this and you look like you know what you are doing..I just started a sw
aq. and my hydrometer says that it is perfect. I put two damsels, 1 striped and 1 yellow tailed blue damsel. They were doing really well, I've had them for 2 days, and this morning when I got up they were both dead.
The only thing that I can figure is that I scraped some of the salt that was on the outside of my filter into the aquarium on accident. Could that have killed them?