Plant fertiliser with shrimp: assess product, dose and water

Assess the full product name, composition, instructions and actual water volume. “Plant fertiliser” covers different products. Trace copper on a label does not automatically mean the same exposure as copper medication, but “shrimp-safe” does not make overdosing or unknown combinations safe.

What the manufacturer says

Seachem describes Flourish as suitable for shrimp when used as directed. This is a manufacturer claim for that product. It does not establish independent testing of every species, water recipe or similarly named product. We do not adopt the FAQ’s general copper threshold and overdose margin as safe aquarium rules.

Check before dosing

• Identify the exact product and current label. Trace mixes, nitrogen/phosphorus fertiliser, root capsules and liquid-carbon products are not interchangeable.
• Use actual water volume and a suitable measuring device. Record every added product and dose.
• Review plant needs, available nutrients and maintenance. A yellow leaf alone does not establish one particular deficiency.
• Do not add more product to disguise an unexplained growth problem. Check lighting, plant choice and dying material.

For bee/Taiwan bee, Cardinal and other specialist systems, the established water recipe remains the starting point. Do not silently transfer a dose from a general planted aquarium. If behaviour changes after an addition, stop that addition and check water, filtration and the timeline. In distress use the problem-solving route; a low home-test reading cannot exclude every product risk.

Sources and scope

• Seachem: Flourish and shrimp
• US EPA: Aquatic life criteria for copper
• Tropica: Plant care FAQ
• UF/IFAS: Ammonia in Aquatic Systems

Seachem makes a safety statement about its own Flourish product. EPA supports the dependence of copper effects on water chemistry without certifying an aquarium dose. The product check is editorial, not an independent test of every species or combination.