That's exactly what happened. I rinsed the sponge on my aquaclear, and it got cloudy as hell for a few days, just starting to clear up this morning.MAD piranhas said:not really, your tank might cloud a bit, but it should be ok. I have done this also. thats mostly how I clean the filter cartridages, because on my filters the bacteria does not lay on the filter cartridage its self, but my bio wheels and bio media....
very good infogrosse gurke said:I think, depending on the chlorine in your tap water, you probably killed most of the good bacteria in your filter. Next time when you rinse your sponge, use tank water and you will avoid this. Also, dont do a gravel vac for a while because this is where most of you good bacteria is now residing.
Your tank is going through a miny cycle because the bio-load is now greater than the leftover bacteria can handle.