Tetra Water Cleaner Gravel SiphonThe Tetra Water Cleaner gravel siphon is a great way to easily clean aquariums up to 55 gallons. The siphon makes monthly water changes easy! It only takes 30 minutes to replace 30% of the water every 30 days. Siphons are a great way to easily remove debris from gravel by moving the water cleaner throughout the gravel. Tetra Water Cleaner comes with gravel siphon, priming bulb, and clip for bucket for a simple set up. For aquariums up to 55 gallons