Fluval Gravel Vac Substrate Cleaner Medium/Large Filtration Do not feed more than

Do not feed more than can be eaten in a five minute period

allowing precise timer settings and individual colour adjustments

while basic or alkaline water will measure between 7 and 14

Spirulina algae added

Fluval Gravel Vac Substrate Cleaner Medium/Large Filtration Do not feed more thanTake total control of the aquarium cleaning process with the Fluval GravelVac multi substrate cleaner. Key Features : Effectively traps dirt and debris, Easy Start siphon for quick priming starts with just a couple of pumps, Thumb operated flow regulator allows you to adjust speed as you clean, Gravel guard prevents clogging, Tube extension included for larger tanks and hard to reach areas, Suitable for all substrates (sand, gravel, rock) and for use