Instant Ocean Marine Aquarium StabilizerMarine Stabilizer maintains ideal chemical conditions between water changes. Use regularly for consistent, healthy water. Marine aquarium chemistry can change quickly with normal biological processes; Marine Stabilizer prevents unhealthy fluctuations. This simple-to-use weekly additive eliminates water care guesswork. The addition of vitamins and minerals helps keep fish active and vibrant. Prevents fluctuations in multiple chemical parameters. Simple to use; no mixing or complicated reactors. No nitrates, phosphates, or silicates.