Step 3: Assembly

1. First you need to cut your sponge the size & shape that best fits your aquarium, you can go for a corner filter...
(The sponge i used is just a regular cleaning sponge so I was able to cut it with scissors. You can also go for an 'aquarium sponge' that you can find at a pet shop, you might need to cut it using a bread knife. )
2. Cut a hole in the sponge to fit your large tube in it. You don't have to go all the way through. mid-way is enought.
3. drill tiny holes on one end of the large tube to let water in from the sponge.
4. Insert Tube in the sponge (tiny holes in)
5. Plug the air line tube to air pump and insert air tube in larger tube.
6. Voilà! Make sure you wash carefully all parts of the filter before moving it in your aquarium.
To fix it inside, you can either weigh it down with a rock or stick it to the side using a suction valve.
<p>Alternately, you can heat a fork to make multiple holes on the tube (if it's thin enough) :)</p>
I heard sponge filters are not good due to taking the good bacteria away and using sponge from ocean or driftwood you risk bringing parasites chemicals or anything that may kill fish, unless u want to dedicate the time to really clean the driftwood,sponge from the beach or ocean.
Wholly incorrect
is it possible to make such an air punp yourself?
You can actually skip the sponge entirely and bury the tubing in a deep gravel bed.
Is there a size limit for this type of filter? Does it work better in a certain size range?
Mission accomplished..! i already make it, now i dont have to buy expensive water pump anymore for my second tank...thanks
Also, an all natural sponge would work (ie: the type that are dried and originally came from the ocean!)
would using a water bottle work for this instead of tube?
This is great! I just bought a filter and it seems too big for our aquarium. I'm gonna hack a filter using your instructible.
word of caution: please be careful using a regular sponge for this... most of the ones you find in the grocery store are labeled &quot;NOT FOR AQUARIUM USE&quot; as they contain some sort of chemical that is not good for the fish. <br><br>best bet is to get a sponge from a pet store that is meant for aquariums. <br><br>otherwise, i like this instructable.
Great idea, thanks! I have a very small setup with a platy fry, a snail, some little red shrimp and some plants. They're all thriving, water chemistry is good, fry is growing. But I couldn't find a filter small enough. This one is working out great. For the larger tube, I used a shampoo bottle from a hotel. I also added a stone so the water would be more still. I burried the sponge in gravel.
great idea! how this works makes sence. im going to have to make one.&nbsp;&nbsp;im trying too breed comet feeders and i think this will be just the thing too clean up after um. Thanks!
<p>first of all its a &quot;sponge filter&quot;. its not &quot;bio- chemical&quot; or &quot;chemical&quot; its biological. don't rince it in tap water, the chlorine in tap water will kill the bacteria, rince&nbsp;the filter&nbsp;in old tank water</p>
what about using an air stone on the air line as well?

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