Cleaning gravel around fry is a study in slowness. The tube stays off the bottom, riding roughly a finger's width clear of the substrate, because waste rests on the surface in a fry tank and lifts away under a gentle pass, while gravel stays put. Digging the tube in is the mistake to unlearn: it clouds the water so fry vanish from view, and it creates the hard pull that small fish cannot resist. Hover, and the physics change sides; debris rises, fry hold their ground near cover, and the cleaner keeps control of where the suction reaches.
Guarding the Intake Every Second
Keep a thumb over the tube end from the moment siphoning starts. The thumb is your instant brake. The second a fry drifts toward the intake, press the thumb down, break the suction, and let the fry swim away before you release and continue. Fit mesh over the intake as a second guard: a piece of fine netting or a sponge sleeve held with a band slows the pull at the mouth of the tube and stops a fry being drawn against it. Neither guard works if your eyes wander, so watch the tube mouth, not the bucket, for the whole pass. Replace a clogged mesh guard promptly, because a blocked intake tempts the operator to press the tube closer to the gravel to keep water moving.
Young fry hug cover. They gather in one sheltered corner, behind plants, or under a rock ledge, and they hold that ground even while cleaning goes on elsewhere. Learn where that corner is before you start, and save it for last, or skip it entirely on a given week. A slightly dirty fry corner harms nothing; a siphon pass through a cluster of fry risks several fish in seconds.
Working in Sections, Then Checking the Bucket
Divide the tank floor into sections in your head and clean one section per pass, moving away from the fry corner rather than toward it. Work the open gravel first, then the mid-ground, and approach sheltered edges slowly, lifting debris with a gentle swirl of water from your free hand ahead of the tube. Take out only the water the job needs. A partial water change done calmly is safer for fry than a deep clean done fast, and the remaining gravel can be covered on the next round, so sections rotate across weeks.
Then comes the step that saves the fish the guards missed. Before any bucket is emptied, it gets checked, every time, without exception. Tip the bucket gently, shine a flashlight through the water, and watch for the flicker of tiny fish among the debris. Return any stray at once with a small net; fry brought back within minutes usually recover well from the trip. Prepare the replacement water before you start, treated and standing ready, so the siphoning is never rushed by a second job waiting. Work at a calm point in the day, when fry are settled rather than swarming for a feed, and keep the removed water volume modest on fry tanks, topping up gently afterward. Assigning these steps through KinsLe's Care Teams makes the routine hold when more than one person keeps the tank: one named person siphons, another named person checks the bucket, and each job is marked done only when it has actually happened. Recording who cleaned which section in the Care Teams notes on KinsLe keeps the next water change just as fry-safe as this one.