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Re:Cannister Filters/Mechanical/Biological

Tom in Austin writes:

>  There
>  are two racks in this in-tank sump, one for mechanical filtration of the
>  main thank (DLS and sponge) and another to hold bioactive media for use in 
>  hospital tank if it become necessary.

Sponges are biological filters.  Yes, they trap the dirt, but they also 
provide excellent surface area for bacterial colonization.  In fact, ANY 
really effective mechanical filter will support large bacterial colonies 
because of their large surface area/volume ratio.

Bob Dixon
Cichlid Trader List Administrator        o
http://cichlidtrader.listbot.com               0