Marina Aquascaper Plastic Plant, Corkscrew Vallisneria, 20 cm (8 in), safe, non-toxic plastic, they will not affect your aquariums water chemistry. The natural colour finish will not fade and is completely safe for a
Periphyton sampler for growing microorganisms on submerged surfaces and then analyzing in lab SS wire frame, reusable glass slides and two polyurethane floats, Perfect for algae, zebra mussels and other growth under a microscope for identification and counting