Oase BioCompact 50 Internal Filter Gift Card sandy substrate and tangles of

sandy substrate and tangles of driftwood

resist algae growth and eutrophication

The API NITRATE TEST KIT for freshwater and saltwater aquariums tests for harmful nitrate levels from 0-160 ppm

Adjustable leveling device - A leveler on the base of the filter lets the filter adjust to a variety of aquarium styles

hard tube worms and clams

Oase BioCompact 50 Internal Filter Gift Card sandy substrate and tangles ofThe BioCompact line of internal filters is perfect for small freshwater aquariums and paludariums. These compact filters are designed to be discreetly installed horizontally or vertically. BioCompact uses biological, mechanical, and chemical filtration for optimal water quality and clarity. The inclusion of activated carbon granules optimizes your aquarium filtration and removes cloudy water, harmful metals, odors, tannins or other colors for clear,