Koller Products TOM Aquarium Mr. Cleaner Battery Operated Gravel Siphon 3-in-1 aquarium cleaning tool siphons water, removes algae, and cleans gravel Ideal for spot cleaning and getting to difficult-to-reach areas; ideal for siphoning nano tanks Nylon bag quickly traps debris and unwanted fish waste Runs on two C-size batteries (not included) Extendable from 8 to 16 inches