http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=12-litres-tank-filration-#1 Guys, Which filter should I use for my 12 litres aquarium? Internal or external? Do you have any experience with such stuff? Thanks! original post: December 14, 2006, 5:00 am anonymous 2008-04-30 http://forum.aqua-fish.net/?topic=12-litres-tank-filration-#2 Hi anonymous , What is the purpose of 12 litres aquarium? In my opinion, you should forget about introducing any fish into such "box" and make it for plants only, so you will not need any filter. Bear in mind that keeping any fish in such small tank can be very frustrating and disappointing for them even if it looks good sometimes. Buy some 7-10 Watt lighting and some air pump + some anubias or cryptocoryne. It will be fine. Martin anonymous 2008-04-30 http://forum.aqua-fish.net/?topic=12-litres-tank-filration-#3 I wanted to house some Guppies there. As I’m reading articles and suggestions on the web, I think it was a bad idea . Fortunately, I haven’t bought any such small tank yet . Tim anonymous 2008-04-30