Collection: Seachem Laboratories

Seachem is the brand most tanks end up relying on somewhere — Prime on water-change day, Stability through a cycle, Flourish in a planted setup.

This collection spans all three sides of the range: water conditioners and biological support (Prime and Stability, in sizes from 100ml to 4 litres), the Flourish planted line including Excel, Iron, Potassium, Phosphorus and root Tabs, plus freshwater mineral control with Equilibrium and Alkaline Buffer, and reef products such as Reef Trace and Reef Kalkwasser. Most of this range is concentrated, so measure doses rather than estimating.