Good Tip or Asking for Trouble?

i dont feel that its going to cut down the need to maintain your filter though. Thats still going to need doing
 
It sounds like you were advised to do something like this. I took a filter like this one and cut a slit in one end.

DrySponge.jpg


Then I slipped it over the end of the tube in my Heterandria formosa tank to save their minuscule fry.

SpongeInPlace.jpg


After a few weeks it looked like the picture. I have not lost any fry since I put it there.
 
properly maintained and set up UG filters are still a good choice. they will create the largest biological filter in your tank.

having a pre-filter does not preclude you from doing maintenance..but it does add more bio filtration and will reduce build up in the body of the filter.
 
I also use prefilters to preclude livestock from getting sucked up into the filter.

But other than that,
Whats the difference? if you have to clean out a piece of foam from inside the tank or from inside the filter? Its actually more of a PITA to fit the pre-filter back over the intake than to just drop the sponge into the HOB. Its six of one and a half dozen of the other.
 
really? I find it pretty easy to remove and replace.. I simply pull the pick up tube up remove the sponge and replace on tube slip back in. the big benefit I find is less mulm build up in the filter. and the added benefit of an extra sponge in case I need to set up a qt/hospital tank.
 
AquaClears are my favorite HOB filters - bearing in mind that I use these filters with aquatic reptiles that really gunk up the water quickly and create at least twice the bioload of a heavily stocked fish tank - I have used a number of sponge prefilters cut to fit the intake, my favorite is a black circular prefilter (by marineland I think) that is predilled and about 8-10 inches long for about $10 at the LFS, I just cut it into 2" lengths and it slips on easily.

Major drawback to this specific set up: if the prefilter gets clogged, the filter motor can overheat and conceivabley shorten the filters lifespan or create a fire hazard, not too much of an issue in a well attended fish tank I think...(anacharis plant leaves shredded by a turtle and floating free in the water did a real number on mine several years ago, lesson heeded)
 
With a prefilter, the mulm builds up in the sponge pre-filter instead of the sponge inside the filter. Again, what's the difference? You're still cleaning a sponge.
 
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