Are you referring to this package deal?
http://www.ecocityhydroponics.com/hp...hobbyists.html
The recommended dosages are okay and shouldn't affect most livestock (i've done that before in a tank with fishes and shrimps and they were all fine, even when i double and tripled the dosages as the plant density increased)... though if you have particularly sensitive fishes, then have to reduce dosages and only gradually increase it over a period of time so that those fishes can slowly adapt to it.
The only additive i don't use is Sodium Bicarbonate (NaHCO3), especially if i'm maintaining a planted tank with active aquasoil (ie. ADA Amazonia) that already buffers KH and pH lower. Adding NaHCO3 can push up the pH from acidic to alkaline and cause an imbalance, its the sudden swing in pH that creates issues for certain livestock.
Btw, what kind of fishes where those that died?
In the meantime, do also check the other parameters in the tank and also the Co2 levels, it might be possible there could be other causes of the fish deaths too.
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