Safe for Shrimp?Updated a month ago

Yes. All APT fertilizers have been tested to be safe even for delicate strains like Crystal red/ Caridina shrimps. APT fertilizers do contain tiny amounts of copper. 

Copper is actually an essential micronutrient for both plants and shrimp - no plant can exist in an ecosystem without trace amounts of copper. In addition, shrimp actually have copper-based blood, using the protein haemocyanin as part of their circulatory system (humans have iron-based haemoglobin instead). Copper is essential for shrimp and they get it from their diet. So while large amounts of copper are toxic to both plants and animals, small amounts are actually essential to both aquatic plants and shrimp. The dosage of copper in APT is carefully calibrated to be far from toxic, even if APT is overdosed. This has been tested over the long term in our many tanks, all of which contain breeding populations of shrimp.

All tanks above use APT 3 with APT Sky.