In a breeding shrimp tank, a sponge filter is never just a filter. Its pores collect the fine food film that baby shrimp graze all day, and its interior is the safest hiding place in the tank for babies too small to dodge fish — or, in a shrimp-only setup, too small to survive being poured away. That dual role changes how the sponge gets cleaned. The goal is to remove the clogging debris that slows the filter while treating every baby in and around the sponge as a passenger who has to be put back. Rushing any stage of that job is how a colony quietly loses a generation in one afternoon.
Shake and Inspect Before the Sponge Leaves the Tank
Start while the sponge is still submerged. Lift it slowly off its base, hold it inside the tank, and shake it gently with short movements, watching the cloud that comes off — babies cling in the pores, and a gentle shake in their own water persuades most of them to swim clear or drop to the substrate below. Then inspect the sponge closely, turning it in the light. Baby shrimp show as tiny pale specks that move against the darker sponge, and any cluster you can see is a cluster to encourage out with another shake rather than carry into the bucket. Only when the sponge looks clear should it travel, moved in a container of tank water rather than dripping through the air.
Squeeze Slowly, in Removed Tank Water Only
The cleaning itself happens in a bucket of water removed from the tank during the water change — never at a sink, and never with fresh water added. Lower the sponge in and squeeze it slowly and softly, letting it expand fully between squeezes so water draws through the whole block rather than just the surface. Work patiently, resting the sponge between rounds; each squeeze clouds the bucket, and in that cloud is exactly where dislodged babies end up, which is why the pace matters. A few soft squeezes that clear the worst debris are enough. A sponge squeezed hard and fast, again and again, sheds babies with every compression and gains nothing in flow that gentle work would not have achieved.
Check the Bucket Before a Drop Is Thrown Away
This is the step the whole method stands on. Set the bucket somewhere bright, let it stand until the debris settles, and then examine it slowly against the light, section by section, looking for the tiny flicking movement that gives a baby shrimp away. A fine net passed gently through the water, or a small container used to scoop and inspect, recovers stragglers without chasing them around the bucket. Pour nothing away until that inspection is done, and when you do pour, pour slowly, watching the last of the water as it leaves. Babies found at this stage go straight back into the tank with a gentle release near cover.
Make the Last Check Somebody's Named Job
Bucket water looks empty at a glance, which is precisely why the inspection gets skipped on busy days — so make it a named duty rather than a shared assumption. Enter it in the Care Teams list in KinsLe as its own task, assigned to Tomas for every filter cleaning, written out as a bucket inspection for stray babies before disposal, and mark it complete only after the bucket has actually been examined and emptied. The named assignment matters because the person who squeezed the sponge is tired of the job by bucket stage, and a second, fresh pair of eyes catches what the first one stopped seeing. At the end of the session, the Care Teams entry inside KinsLe records Tomas's inspection as done, with the number of rescued babies noted for anyone curious next time.