Internal filters- sit inside the tank, pump water through sponges or other media to remove water particles and give the good bacteria a place to grow.
Internal Filters.
A powerhead sat on top of a canister of sponge media. The powerhead draws water through the media via vents in the canister.
Small internal filters fed by air
These also work with an air pump, but a small filtering medium, often made up of foam, replaces the sand. They are only effective in small aquariums with a capacity of 50 liters or less.
Internal filters comes in many sizes, with smaller ones having smaller flow rates and vice versa. The smallest internal filters are mainly for mechanical filteration and the media compartment only contains a small sponge.
INTERNAL FILTERS
Not as common a filter but a much less alternative to expensive and bulky canister filters. Internal filters are basically a power head with a filter of varying capacity attached.
Internal filters come in many different styles, and are simply placed in the aquarium either on the substrate, or mounted to one of the sides with suction cups. They include corner box filters and sponge models.
Internal filters by their very design have their inlet positioned at the bottom of their box and therefore get water from the least oxygenated part of the aquarium. You need to keep oxygen levels above 4 mg/L.
Filtration: Internal filters (3 sections) with a pump flow of 550 lt/hr. Filter media: synthetic wool and ceramics.
Lighting: one 18 watt lamp (which stays on for about 10 hours / day) plus indirect light for 7 more hours.
bubble filters These internal filters use a lift tube to draw water through a foam block, as in a sponge filter. buffer A substance which is dissolved in the water to boost the alkalinity and/or adjust the pH.
I already used small internal filters (both earlier Fluval models and several different Eheim models) in several of my tanks for current (especially the RFUG filtered tanks), so I adopted these in my canister-filtered tanks as well.
BUBBLE UP FILTERS These are specific examples of internal filters. These use streams of air bubbles to push water up and out of a tube, thereby creating a pull of water into the filter through the filter media. (See INTERNAL FILTERS).
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.
Internal filters such as the Pond Master line come as complete kits and are easy to setup and use. The disadvantage of these filters are the limited types and amount of filtration media that can be used in them.
A canister filter is located outside of the tank, this allows the filter to be a lot larger and hold a lot more filter media than internal filters. Canister filters are considered a mid to high-priced filter system.
There is a diffuser of white acrylic protecting internal filters and a silicon-based and blue-enhanced photodiode. These filters and diffuser are long lived. I had my LI-192SA sensor rebuilt after 9 years of heavy use (and 50,000 measurements).
Internal filters can be placed in here, along with a heater stat. If these are fully covered by the water, they can be plugged in and turned on, keeping the water moving through the filter.
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 ...
As the air bubbles rise, a current is generated which continuously brings water from the aquarium, through the substrate and to the top of the tubes (i.e., lift tube). These internal filters can also use the lift tube to draw water through a foam ...
 See also: Internal Filter, Filter, Water, Fish, Aquarium
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