e burna
Aquarium Advice Activist
Get a test kit. Read up on fishless cycling and follow that and your fish tank will be up and running in no time at all.
Also read up on the nitrogen cycle and you will see how your fish died.
Again (w/out being able to ace a test on it lol) I am 'familiar' with the cycles of fish... I guess maybe a good question for me to ask is this: Is salt water cycling different or more touchy than fresh water cycling? I've had freshwater fish as a kid, and currently have a 36bow tank that homes cychlids and tiger barb together (happily might I add)... I'm familiar w/how it works, I've known in my travels at that size to just add 1 or 2 at a time, wait a few weeks, etc, etc... but in this case it didn't work? I would have thought (unless there's some secret to salt water I'm not aware of) that 5 small fish in a tank that size (125 gallon) would not have had the sharp spikes that 5 fish in a 20 or even 10 gallon tank in which case I would think that was the issue.