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Author Topic: external or internal?  (Read 6077 times)
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United Kingdom United Kingdom

Posts: 37

« on: September 27, 2016, 04:58:21 AM »

Hi what would be best for 180l tank.
I'm thinking about fluvial u4 (was going for tetrac ex1200 but to many bad reviews (leaking). actually that why I am worried to go external... I simply can not afford a leak. And I do go away for few days every now and then.
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« Reply #1 on: September 27, 2016, 05:00:14 AM »

edit.. (is there a way to edit post rather then make another one?)
Do I need air pump ? it will be planted tank.
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Tanks: 20- from 5.5 to 150 gals.
Posts: 352

« Reply #2 on: September 27, 2016, 08:29:32 AM »

Go external. The real purpose of a filter is to provide the container and media where the actualy microorganisms that do filtration can live. Therefore, the more filter media one has, the better the filtration will be, Internals take up room in a tank and are generally smaller than externals. The best internal filters would be things like foams/sponges or what is known as a Hamburg Mattenfilter.

Over the years I have kept bout 20 tanks running. I have never used an internal filter save for the foams/sponge type. I have also had leaks. But the worst of them has never been filter related they have been related to tank failure.

An air pump is rarely a requirement. The way it works is to cause the rising bubbles to break the surface tension which allows for the ready exchange of gasses between the water and the air. Air power will also drive water movement up the tube of a sponge filter or over the top of a Mattenfilter. The air bubbles themselves provide very little oxygenation, they would need to be much finer and in contact with the water for much longer than most tanks allow.

“Everyone is entitled to his own opinion, but not to his own facts.” Daniel Patrick Moynihan
"The good thing about science is that it’s true whether or not you believe in it." Neil DeGrasse Tyson
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Posts: 37

« Reply #3 on: September 27, 2016, 02:44:30 PM »

thank you .. that quite informative.. nice to learn new things Smiley
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Gender: Male
Ireland, Republic of Ireland, Republic of

Tanks: 240, 100, 70, 50, 30, 30, 25 Litres
Posts: 1,040

Theres more water than air in here :P

« Reply #4 on: September 27, 2016, 05:45:25 PM »

The reason external filters leak is because people dont maintain them properly or else they assemble them incorrectly...

External filters are the way to go all day long...Easier to maintain and allow for more media (hence more biological filtration capacity)

Oversize your filter always!!!!

Oh and two filters on one tank is the way to go....If one fails you have backup!

I have nine tanks of various sizes and run two filters on all of them....


I love to hate Water Changes! :P
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