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Don't use hot water or anything chlorinated - that'll wipe out your beneficial bacteria colony. Instead, rinse the sponge in old tank water (water you've already removed during a water change) using your fingers to gently squeeze out debris. If the sponge is really gunked up, you can swish it around in a bucket of that tank water a few times, but avoid scrubbing hard or rinsing it under tap water. This keeps the bacteria intact while removing the physical gunk that restricts water flow.
The tank water method everyone mentions works great, but here's the thing - you want to squeeze that sponge *gently* in the water instead of aggressively wringing it out. Aggressive wringing can damage or dislodge some of the bacteria colonies you're trying to keep. Just let gravity do most of the work and give it a few soft squeezes. You'll still get the gunk out without massacring your biofilm.
A hack that doesn't get talked about much: if your sponge is really gunked up, do multiple rinses in fresh tank water rather than one intense cleaning. First rinse gets the loose debris, second and third rinses clean deeper without you having to squeeze as hard. It takes maybe an extra minute but your filter bounces back faster because you've preserved way more of your bacterial culture. Also pay attention to *when* you clean it - if the tank's running rough (bad parameters, algae bloom), waiting an extra week to clean can actually help stabilize things, whereas aggressively cleaning during a problem can stress the colony even more 🍄
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