With all the extra food in the tank are you keeping up with water changes? How's the ph and nitrate?
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No, don't replace the sponges as you will loose a lot of bacteria. Curious though, what is the light green coating on them?thank you for the reply. i have an fx5 which i will clean out tonight. it is running on my 90 gallon sump. i will look into a UV sterilizer, will be getting a test kit today also. do you guys think i should entirely replace the sponges on my sump? theyre not that grimy, just a light green coating, and then tons of bioballs under the sponges, should i replace them or keep for the BB?