Sponge filter causing over-active skimmer

[Zoaelite]

It's perfectly normal, filter socks will do the exact same thing. Rinse them as much as possible prior to adding, how often are you replacing them? Sponges tend to accumulate detritus which can attribute to high nitrates.

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[syncro]

How long will it overactivate the skimmer? Days or weeks?

The sponges are seeding for a quarantine tank. Thanks.

[syncro]

Soaking the sponge filters with Aquavitiro Alpha (a dechlorinator) overnight solved the problem.