If you run sponges, you need to rinse them frequently, and when you do rinse them, not in tap water, but in tank water so you don't kill all the good bacteria, just get rid of the solid waste.
problem is, how often do you have tank water that you can rinse in? I had that same issue and would only be able to rinse when I did a water change. Now I just have it for flow with some live rock rubble and to house the occasional phosphate removal or carbon filter insert.
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