Very likely the cause of the fish dying is ammonia. Your larval tank water may have had ammonia and low ph. At a low ph, ammonia is in a non-toxic form. Phyto has a very high ph because there's almost no Co2 in the water. When you add phyto quickly to a larval tank with low ph, you can cause all the ammonia to turn toxic, killing the fish quickly.
For this reason, I always drip phyto into the larval tanks.
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Chad Vossen
Current Tank Info: just a bunch of fish :)
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