Hi is that the one with three plastic cannistors in? Or with a seperate long plastic thingy and a couple of plastic tubs down the other side? It really doesn't matter as basicaly they all work on the same principle

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Bottom - container - large ceramic prefilter.
Middle - sponge or plastic mesh type stuff.
Top - either the polywool or sintered glass.
Hope this helps

Latest update 29/4/10 well only got four fish now - 2 syds and 2 B/Ns. All fish are equal.