Do I need a sponge in my HOB? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 15 Old 07-27-2011, 03:01 PM
after the first foam piece, you wont get more mechanical filtration out of the filter. The foam also offers more surface area than ceramic pieces, but the key is that the ceramic wont obstruct flow as much as additional foam will.
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post #12 of 15 Old 07-27-2011, 11:23 PM Thread Starter
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I stopped by petsmart and picked up a Fluval Edge Pre-Filter Sponge ( Fluval Edge Pre-Filter Sponge - Filter Media - Fish - PetSmart ) for both of my HOB filters. Its only been 6 hours are there is a decent amount of debris on these things. Mostly little plant pieces b.c i was re-arranging the tank. Im thinking these will act as a bio-filter. They fit snug on the filter tube and Im not noticing a a reduced rate of flow. I bet once they get filled with debris it will slow the flow but a quick rinse in some separate tank water should clean them off

I also bought AquaClear BioMax Filter Insert ( AquaClear BioMax Filter Insert - Filter Media - Fish - PetSmart ) for each HOB filter. They fit nicely in the filter and just like the pre-filter sponge, there is no reduced flow.

I think this takes care of my bio-filters
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post #13 of 15 Old 07-28-2011, 08:17 PM
Ahh....I thought you were talking about sponge inside to replace the cartridge.

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post #14 of 15 Old 07-29-2011, 11:04 AM
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Looks like you have a good filter and bio media. Basically what I did but put the sponge inside on on the intake. It's been working great for a few months now.

The benefit to the intake sponge is no fish, or invertebrates to get stuck or into the intake.
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post #15 of 15 Old 07-30-2011, 12:46 PM
I like the idea of putting the Fluval prefilter on the inlet tube so I picked up a couple to use as a trial.
I think it adds an extra sponge filter dimension to the HOB filter!
Great idea...(as good as the water bottle baffle for return flow reduction!)

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