Possibly. Flourish Phosphorous™ is exclusively intended for freshwater planted tanks and not every type of aquarium fish is suited to this type of environment. Research your fish to know what kind of aquarium environment they prefer. Additionally, many fish, plants, and invertebrates are stressed by sudden high-percentage water changes and shifts in water parameters. We recommend to alter nutrient levels slowly (do not overdose this product) and keep water changes to 30% of the tank or less. More sensitive tank inhabitants will do better with smaller, more frequent water changes and slower alterations of water parameters.
On top of this, Flourish Phosphorous™ is specifically intended to be used in planted aquaria that need more phosphorous to grow plants. If your tank does not currently need more phosphorous, we would recommend against adding more Flourish Phosphorous™.
Flourish Phosphorous™ Compatibility Guide
Green: This product is safe for these tank inhabitants. Take care to avoid sudden large shifts in water parameters within the tank, and review the dosing instructions carefully to avoid improper dosing.
Orange: These tank inhabitants are more sensitive, and while the product can still be used on them, it's best to start with a partial dose and work up to the full dose over time.
Red: This product is either notably stressful or utterly unsuitable for these tank inhabitants. It would be best to opt for a different product if possible. Click tank inhabitant name for alternate products.
Black: There should never be any need to use this product in a tank with these tank inhabitants - we have no data as to compatibility for this reason. Click the tank inhabitant name for alternate products.
| Freshwater Community Fish | Saltwater Community Fish | Scale-less fish |
| Sharks | Rays | Eels |
| Freshwater Sharks | Freshwater Rays | Freshwater Eels |
| Loaches | Catfish | Aquatic Frogs |
| Shrimp | Snails | Clams |
| Plants | Corals | Exotic Invertebrates |
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