Possibly. Reef Advantage Magnesium™ is exclusively intended for saltwater tanks and not every type of aquarium fish is suited this type of environment or to the magnesium levels which Reef Advantage Magnesium™ can be used to create. Research your fish to know what environment they would prefer. Additionally, many fish, corals, and invertebrates are stressed by sudden high-percentage water changes and shifts in water parameters. We recommend to alter magnesium levels slowly 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.
Reef Advantage Magnesium™ is an excellent supplement for corals and invertebrates alike, and can certainly be used in a fish-only (FOWLR) tank. However, tanks without invertebrates like corals will not tend to use up magnesium over time, and rarely need to be dosed with magnesium supplements if a high-quality salt mix is used.
Reef Advantage Magnesium™ 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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