DIY Biological Fish Tank Aquarium Filter - YouTube

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If you have a 120 gallon fish tank, and you have a that is designed to support your120 gallon tank, and you use only the power filter, you should haveenough biological filtration to support your 120 gallon tank.
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Good biological filtration is essential in aquariums with either a high fish load or few to no plants. We've discussed to basics of bio filtration in other videos but haven't yet talked about the various types of media used to facilitate it. It's true that nitrifying bacteria live attached to surfaces throughout the aquarium but for non-planted tank owners this simply is not enough to detoxify all the ammonia produced by fish and microbial activity. Implementing an efficient bio filter can make all the difference. The question still arises: What type of bio media should I use??? Aquarium Fish Tank Super Bio- chemical Bio- Sponge Filter Fish Tank sponge
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Photo provided by FlickrAquarium Fish Tank Carbon Filter Sponges Foam Pad Bio Biochemical Sponge Filters
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You will notice in the diagram that I have placed a media grid underneath the media. Sometimes debris can collect at the very bottom underneath all the media, this doesn't normally happen with bio balls, although I have experienced it happening with Alphagrog. This media grid will help ensure there is always a void underneath the media so the water can flow freely between the two chambers.

Another bit of useful advice would be to use media bags inside your sump filter. This basically means that instead of having to scoop media out by the handful, the media is contained in a bag which just needs to be lifted out in one go. My philosophy is if you're going to go to the extent of installing one of these filters then do it properly and make life as easy as you can for yourself. Finally, if you really want to make your sump efficient when it comes to cleaning, you could put some outlets on it so that you basically attach a tube, open the taps and then drain all the crap out from the bottom.

A sump filter is definitely the way to go if you are going to set up a large aquarium containing lots of big fish. Commercially available canister filters will work, but they will become dirty very quickly, you will also need more than one filter if you have a big tank, these filters don't come cheap. For a fraction of the price of a large canister filter, you could set up a large sump filter that will completely blow any commercial filter out of the water when it comes to efficiency.If, on the other hand, you use both of these aquarium filters onthe same 120 gallon fish tank, you will have enough biologicalfiltration to support your 120 gallon tank - not enough to support a240 gallon tank.The capacity of a , provided that you have sufficient filtration to supportenough biological filtration for a tank the size of yours, isdetermined more by water volume and available oxygen than by thenumber or configuration of the being used. So, if you have a 50 gallon aquarium and a filter for a 30gallon tank, your population will be limited by the undersizedfilter. However, if you have a 30 gallon aquarium with enoughfiltration for a 50 gallon aquarium, that fish tank really has thesame as a 30 gallonaquarium with filtration appropriate to a 30 gallon aquarium.However, if you were to use these same two aquarium filters on a180 gallon fish tank, you should be able to provide enough biologicalfiltration for that 180 gallon aquarium.