HOW TO: DIY moving bed aquarium filter

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A cheaper and more powerful alternative to this media:

A cheaper and easier way to build this sump:

This is a video showing how i built and made a fluidized bed filter.


The king of DIY


What do you think?


Written by The king of DIY

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  1. Any reason you can't place the first baffle off the bottom and then a second baffle (to get the water to flow into the top of the media chamber), rather than using 2 pipes+bulkheads?

  2. i found a cheaper option for the sump project … I used a female and male fitting with a little silicone because it doesn't have to be completely water tight in the sump over using the bulkheads … but great video for sure

  3. Hey joey ( or anyone that may know) I'm going to turn my overflow into a moving bed filter and was wondering what product I should use ( k1,k2 or k3)

  4. Hey Joey. First off I'd like to say thanks. I found your videos about a year ago and they have really helped me out and inspired me to take my hobby even further. I'm building a sump for my 125g tank out of my old 60g tank and I want to use the moving bed method. Do I have to use the K1 Media or is their something else that will work the same way?

  5. i have a trickle filter that goes into a refugium,im thinking about putting the k1 and an air supply into the refugium and removing the sand,would you recommend this or not

  6. hi joey…i am using wet dry system for my 90 gallon….have been looking at this for a while now…i guess i would have to make it in acrylic to be able to use my WONDERFUL automatic change of water..thanks for that..i am 68 and lifting 5 gallon bottles of water above my head was hard what do you think the thickness of the acrylic should be ??? thanks in advance..

  7. Joey,
    How do you know how much sump space, media, air flow, etc to use vs aquarium size and bio load? I've set up a 125, dirt substrate, very light bio load now, but preparing it for a planted discus tank. 

  8. hi joey, i know you probably answered this question before but what's the difference between k1, k2, k3? what's your recommendation for a 160 gallon saltwater aquarium?

  9. Love your videos and appreciate the time you spend making them. Any thoughts on cutting up plastic scrubbies to use as media in a smaller version? Unless they just fall apart, I can't imagine why they wouldn't allow bacteria to grow while being moved around. Thanks ahead for your comments.

  10. Do you still like your kaldness filter? Does the media change it's flow pattern dramatically after it has been established and some bio film has built up on it? THANKS great video with the rick you two are the tops

  11. Joey, really enjoy your videos. I use pre filter trays like you, K1 media and drip systems on my tanks as well and drain them to my basement sump. Regarding your filter design-I found that using old under gravel filter plates work awesome for the last section of the filter. The wide area allows good water flow through to the last chamber and keeps K1 from clogging up against the outflow. Just thought I would share another alternative. Love the K1 media

  12. Hello I'm Alberto, the first you're the best and I've seen all your videos, I wanted to know the name of the material that you use, thanks for all the wonderful tips…. Excuse my english I'm Italian

  13. Overall what would you say the easiest and most efficient sump for a fresh water set up? What should the sump consist of? Thanks in advanced. Maybe make another video on this. But updated 2013-2014

  14. Bro is it true you should not plumb an aquarium with abs because over time it releases some sort of chemical in the water. PVC is the proper material to use. Can you clarify this? Just because if I can use abs maybe I will as it's cheaper in material. Thanks bud you came a long way as I noticed this is a much older video of yours. Great job

  15. what kind of motor are you using. Im thinking of doing this for my 55 gallon and I have a 29 gallon spare tank which I'm going to use for a filter. This would be a awesome project I would love to finish with your tip. thank you sir. Nice filtration by the way. good luck.

  16. Thanks man your a life saver! I asked my forum but only got responses like "I'm focusing to much on filtration and not concerning myself with WC" or "there are to many other factors to properly determine waste output for your fish"… It's nice to know people actually do know their stuff! I also have a person tell me that k1 is about as good as a sponge filter… I'm going to go out on a limb here and call shenanigans!

  17. Joey can you help me out… I am taking this design and making a sump under my 150 discus show tank. I watched your video on how to properly size k1 to fish waste but I can't seem to figure out how much I will need (in liters) for a show tank of projected 20 fish. Thank You!

  18. Can you mix Ceramic with Plastic? It seems like K1 is more superior in moving water while Ceramic is better if you want simply have it still. If we refer to PondGuru's Ceramic Biohome Mini ultra.



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