By ShowMeStepByStepPublished Updated
Based on a video by The Fish Files.
Cleaning aquarium gravel sounds like it should be a major operation - net the fish, dump the tank, scrub everything. It isn't. A siphon vacuum lets you pull all the waste off the bottom of the tank while the fish stay swimming, and the water you remove doubles as a partial water change.
This walkthrough from Chris at The Fish Files breaks the technique into seven simple steps. Once you've done it once, the whole job takes 10-15 minutes for a typical home tank. Repeat every 2-4 weeks and the tank stays clean indefinitely.
You need a siphon vacuum (also sold as a gravel cleaner) - a wide plastic tube attached to a flexible hose. Brand barely matters; functionally they're identical. The wide tube is sized so it pulls waste up but lets gravel fall back.
Pair it with a clean 5-gallon bucket. Don't use a bucket that's ever held soap or cleaner - residues are toxic to fish even at trace levels. A dedicated aquarium bucket is the safest setup.
Set the bucket on the floor next to the aquarium stand. The siphon uses gravity, so the bucket must sit below the tank's water level for water to flow out.
If your tank is on a low stand, slide the bucket farther away or use a deeper bucket so the hose end can sit below the tank's water line. The bigger the height difference, the stronger the siphon.
Submerge the wide plastic tube fully into the tank water. With your other hand, hold the hose end over the bucket and shake the wide tube up and down quickly a few times. Water fills the hose and gravity takes over.
If the siphon doesn't catch, try sucking briefly on the hose end (some people do this; not everyone is comfortable with it) or use a self-priming model that has a hand-pump trigger.
Once water is flowing, the tank will keep draining until you stop it. Pinch your thumb over the hose end to slow or stop the flow on demand.
You want a steady pull, not a rushing flood. Too much suction lifts the gravel up the tube; too little doesn't pull waste up effectively. Adjust as you work - tighter when over fine debris, looser over heavy gravel.
Push the wide tube straight down into the gravel until it touches the tank bottom. Waste, fish poop, and uneaten food get sucked up into the tube while the gravel itself is too heavy to lift.
Move the tube spot to spot in a grid pattern across the tank floor. Don't just hover in one place - work systematically so you cover the whole bottom rather than missing whole sections.
The fish stay in the tank during the whole process. The tube doesn't suck them up - they're far too big for that, and the suction at the bottom of the tube is gentle by the time it reaches the wide opening.
If a fish swims close, just point the tube somewhere else briefly. Forcing fish into a net and out of the tank stresses them way more than the vacuum ever will.
Stop when about half the tank water has drained. You've just done a 50% water change as a side effect of the gravel cleaning - perfect frequency for monthly maintenance.
Refill the tank with fresh tap water that's been treated with a water conditioner (dechlorinator) - chlorine in untreated tap water is toxic to fish and beneficial bacteria. Match the temperature roughly to the existing tank water if possible. Done.
Tip
Do this every 2-4 weeks for a moderately stocked tank. Heavy stocking or messy fish (goldfish, cichlids) need it every 2 weeks; lightly stocked planted tanks can stretch to monthly.
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