I have a small amount of sponge that came in on some LR, which is dying off. Do I have to remove the sponge manually or can I let it die off and keep carbon running in my filter to get the toxins?
If its truly a small amount then I would let it go and let your biological filtration take care of it. As always monitor your parameters for adverse affects. I would hope the biological filtration is strong enough to handle something so minute.