My fish / shrimp died!Updated a month ago

When used according to instructions, APT FIX and APT FIXLITE are safe for fish, shrimp and other livestock.

However, biological interactions are complex, and if you experienced livestock death, it is possible that some combination of factors came together. 

Please note:

1. Livestock moving to the surface is consistent with CO2 poisoning: too much CO2 with insufficient gaseous exchange.
2. Over-dosing beyond the recommended amounts can have an adverse impact.
3. A common 'silent killer' is a localised spike in volatile organic matter during replanting / maintenance when the substrate is disturbed / moved. This temporary spike can kill livestock while water measurements indicate 0 ammonia and/or nitrites.
4. Inconsistent power supply may pause flow and cause oxygen levels to momentarily drop to dangerous levels, killing livestock.
5. Newly introduced livestock may appear healthy for a few days, but may succumb to stress and trauma experienced during transport.