Sponge filters.

[evox53187]

I have 3 double sponge filters in my 125 gallon tank along with my 2 hw304b and one emperor filter. Are these 3 sponge filters really doing anything or should I go bigger... Thanks guys
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[E.C.]

you might want to read this.

http://www.monsterfishkeepers.com/f...9-The-Woefully-Underappreciated-Sponge-Filter

 

[jhc7685]

I wouldn't go bigger since you already have other form of filtration. Those small sponge are like an added bonuses.

 

[Gill Blue]

all sponges are not created equal. keep the filters, replace the sponges.
http://www.swisstropicals.com/Poret Filter Foam Pricelist.html