NoClean Aquariums GravityFlow Self-Cleaning Betta Aquarium - The Original Self-Cleaning Fish Tank The is the OLD VERSION of this product. Brand new GravityFlow version (2nd Generation) available on Amazon! Simply pour clean water in and dirty water flows out! It's so easy a child can do it! No removing stones, plants or decorations before cleaning! It's the spill-free, mess-free and FUN way to have a Betta Fish tank! No expensive replacement filters, annoying noise, electricity usage or unsightly cords... display it practically anywhere! Stones, Plant & Fish NOT Included