External filters- work in a similar way but they pump water out of the aquarium and through the filter media before pumping it back in.
External filters: Pretty simple, a filter which is located outside of the tank.
External filters
The water siphoned into the aquarium passes into a filtration bay containing several filtering media and is sent back into the tank by means of an electric pump.
Under-Gravel and External Filters
Lighting
Fish require adequate amounts of light and dark, like most other creatures on the planet. Correct lighting is essential for the biological clocks and eating patterns of your fish.
UV sterilization is also in line (two 8-watt units from Aquanetics) to the external filters and stay on for 8 hours daily. I also use a CO2 injection system, which consists of a 2.
net ("Mike Kabat") says: >What are the tools and techniques needed to drill holes in tanks for >external filters etc? >This is for tempered glass tanks 10-55 gal. > > A special glass drilling bit is needed to drill holes in glass tanks.
External Filters are generally the largest of pond filters, and are located above ground (some may be partially buried) somewhere near the pond itself.
Although some recommend using underground filters, external filters and bio-wheels simultaneously to maintain quality, my experience is that underground filters are not suitable for mbunas.
The most common filters are undergravel filters, external filters, or internal filters. Each of these has a media with a lot of surface area for the bacteria to live and grow on.
There are many different types of filtration available for your tank however by far the best are external filters. Do not, ever, use an Underground Gravel FIlter in a planted tank.
EXTERNAL FILTERS Oftentimes, this is used to denote power filters. But this not always the case. (See POWER FILTERS) FOAM FRACTIONATION See PROTEIN SKIMMERS. INTERNAL FILTERS These filters are plastic cartridges that fit inside the aquarium.
I recommend the use of Large external filters with biological filter media in it i.e. ehiem ehfi substrat. Ok so you break the ammonia and nitrite down to nitrates. You need an effective method for removing this from the water.
I am a big proponent of biowheel media, which are external filters that hang off of your tank and remove large particulate while running the water over a wheel which contains the bacterial colony before returning the water to your tank.
But if you're setting up a new tank you should definitely give preference to external filters. For smaller tanks, power filters work very well and don't cost too much. For larger tanks, canister filters are excellent options.
The external filters are the best if you can afford around $150. The under-gravel is least desirable; however, you can entwine the under-gravel filter with an internal or external filter to achieve good results.
These are usually blue or black plastic, virtually hollow balls of various sizes (2.5-5.1cm (1-2") in diameter which are used in the biological nitrifying filtering of large external filters.
Corner filters, box filters or internal power filters are the main contenders (sponge and under gravel filters are usually just referred to as sponge or undergravel filters). Internal filters offer less surface area than external filters so are ...
There is water held in the substrate (which exchanges with the water column by diffusion only, other than with the use of UG, RFUG, or heating cables), and in any external filters or refugia (HOB/HOT, canister, sumps, etc.) exchanging with the water ...
Useful for creating extra currents in reef tanks. Driving Ultra-Violet Sterilizers (reduction of particulate matter, increasing U.V efficiency). Providing filtration when external filters cannot be installed.
Fluval 1/2/3/4 plus
replacement media ...
 See also: Filter, External Filter, Water, Fish, Aquarium
  
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