What's the best way to clean an in-tank filter without getting rid of all the good bacteria?
eg - Do I fill a jug with water from the aquarium, move the filter quickly from the aquarium to the jug, and then dismantle the filter in order to get one of the two filter sponges out? Do i then just squeeze clean the filter sponge (whilst in the jug and wet), return it to the filter, and put it back into the aquarium? Or do i take the sponge out completely, wash it thoroughly under the tap, and then put it back (and hope the "good bacteria" on the second sponge in the filter soon grows back onto the first sponge)?
I'd heard that taking the filter out of the water to clean it would kill the good bacteria - hence the transferring it to a jug to open it up (rather than disturb the fish and have any "gunk" float out).
Any other ideas?
eg - Do I fill a jug with water from the aquarium, move the filter quickly from the aquarium to the jug, and then dismantle the filter in order to get one of the two filter sponges out? Do i then just squeeze clean the filter sponge (whilst in the jug and wet), return it to the filter, and put it back into the aquarium? Or do i take the sponge out completely, wash it thoroughly under the tap, and then put it back (and hope the "good bacteria" on the second sponge in the filter soon grows back onto the first sponge)?
I'd heard that taking the filter out of the water to clean it would kill the good bacteria - hence the transferring it to a jug to open it up (rather than disturb the fish and have any "gunk" float out).
Any other ideas?