Is Seachem Fert Series Safe...

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I use Flourish twice a week in my two guppy tanks, with adults, juveniles, and fry. Primal is still actively producing a healthy amount of fry every month, and I have noticed no deaths or deformities.
 
It depends which of the fertiliser series you are using. Flourish Comprehensive Supplement for the Planted Aquarium is safe. But I would not use Flourish Excel in any tank with fish, fry or adults.
 

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