Seachem Laboratories Reef Potassium Supplement 100 mL, 3.4 oz

If you are tending a thriving reef aquarium, you already know how much your corals depend on steady water chemistry. Seachem Laboratories Reef Potassium Supplement gives you a focused way to support that chemistry in a concentrated 100ml (3.4 oz) size. According to Seachem, potassium is an essential element required in metabolic processes, protein synthesis, and the growth of corals and macroalgae, so keeping it in range matters to the living things in your tank.

• Targets potassium specifically, giving you a precise way to raise potassium concentrations in your reef system.
• Seachem notes it raises potassium effectively without also adding phosphate or dissolved organics, so you are not introducing extras you do not want.
• Concentrated formula, which means a little goes into supporting the element your corals and macroalgae draw on.
• Supports the metabolic processes the brand describes as essential to coral health.
• Helps support protein synthesis, one of the building blocks of coral growth the brand highlights.
• Backs the growth of both corals and macroalgae, useful for mixed reef and refugium setups.
• The 100ml (3.4 oz) bottle is a manageable size for smaller reef tanks or for keepers who want to dose carefully.
• Made by Seachem Laboratories, a name many aquarists already keep on the shelf for water care.
• Designed as a clean way to top up a single element rather than a broad blend.
• Fits naturally into a reef maintenance routine alongside testing and regular water changes.

Think of this bottle as a tool for the reef keeper who likes to dial things in. When your testing shows potassium drifting low, Reef Potassium lets you nudge it back up on its own terms, without the phosphate or dissolved organics Seachem says it leaves out. For anyone caring for corals and macroalgae, that kind of targeted control is reassuring. Keep your test kit handy, follow the brand's dosing guidance for your tank volume, and let this concentrated supplement help you give your reef the steady environment it depends on day after day.