Seachem Focus KH testing or several hundred

or several hundred

Purigen darkens progressively as it exhausts

Performs continuous light-level monitoring for your aquarium

For use in a fluidized reactor

Uses one AA size battery (included)

Seachem Focus KH testing or several hundredFocus is an antibacterial polymer for internal infections of fish. It may be used alone or mixed with other medications to make them palatable to fish and greatly reduce the loss of medication to the water through diffusion. For use in freshwater or marine aquaria. When to Use a Medicated Food Mix Your fish has an internal infection Bloating, abnormal stools, loss of appetite, and weight loss are all signs of a potential internal infection. You are