Fish Tank Sponge

Fish tank filter sponge turned red?

I have a 15 gallon fish tank and I clean it regularly. I have had it for about 12 years. Recently when I was cleaning the filter the white sponge that is in the filter was red. I don't know what this means and I have yet to be able to fix the problem. The fish seem healthy, I have had two deaths in the pat two months (very old fish) which is rare for me because my fish seem to live for years and years. If anyone knows what this might be can you give me some advice? Thanks!
The sponges are fairly new and I have never had them turn red before just brown. I know they need to be changed and I do that about once a month, but they are still turning red, like a bright red.
no I have not gave them any medications. I have changed foods but this was happening well before I changed anything. I have been adding conditioning salt to the tank to try to get rid of bacteria the natural way before I use medications to help the problem. so far nothing has worked.

Well, if there is too much waste, that could be a problem. Basically, that's the only answer.

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