under gravel filters...

[fish_chic]

okay i have ugf and a emperor 250 (i think that is the ghp) any way how much work is my ugf doing to clean my tank of debris?

 

[Dan Steveo]

the ugf is basically biological. the bacteria in the substrate will eat the waste in the substrate thus making your tank clearer and cleaner. the ugf works by air and is efficient if set up correctly. to be successfull the substrate must have enough bacteria.(a cycled tank)(it can be more successfull after a while).

 

[MissFishy]

None. UGF's usually just trap debris under them. Unless of course it is a reverse flow, then it pushes all the debris out into the water where another filter might be able to filter the gunk out of the water.

 

[fish_chic]

well with the comments i think the ugf is coming out today (as some as my babes lay down for a nap). thanks every one

 

[GIS Guy]

Depending on the amount of debris under the ugf, the water will become very dirty.
Do some water changes and wash out the filter pad 'cuase it's gonna get gunked up.