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He already answered it was an ammonia spike - he made a mistake on the first test...Sorry to hear of losses. Lets go through a few things that are generally critical with initial stocking.
First and always are your parameters (levels). You have quite a few Zeros for what appears to be a newer tank, which tells me you may be using an API test lit. If so, they are notorious for false readings.
- Are you using RODI or tap water from the faucet ?
- Age of tank
- Type of test kit(s) used
- Type of filtration ?
- Amount of water movement and what youre using for Pumps
Suspected issues:
Age of tank
Typical chemical spikes (ammonia and nitrate)
Possible sick fish or more than one
Filtration. Ammonia, nitrites, and nitrates can build up fast in a marine aquarium. As the high ph requirements for a saltwater tank indicate (8.3), saltwater fish are very intolerant of even the slightest change in these parameters. Vigorous filtration helps move the nitrogen cycle along.
I recommend to take a water sample to a trusted Store that DOES NOT use API test kits and have them check your water to see what they come up with and to compare with your readings.