It has 3 openings and plenty of room for a game of peek-a-boo
GUARANTEED ANALYSIS
Made from high quality insulated glass
amino acids
classic and economical aquarium filter
Fluval BIOMAX Filter Media, 500 g (17.63 oz) Digestive & Urinary It has 3 openings andFluval BioMax rings have a complex porous design that ensures optimal contact time as water passes by for efficient biological filtration and beneficial bacteria growth. Biological filter media Greater capacity than most biological filter media Also helps reduce and control ammonia and nitrate For Fluval filter models: 106, 206, 306, 406, FX5, FX6, 105, 205, 305, 405, 104, 204, 304, 404 For freshwater and marine aquariums