Understand the dash before you blame the fish
Panda corydoras are bottom dwellers, but like all corydoras they periodically rocket to the surface to gulp air, using their gut as a supplementary breathing organ. In a settled tank that trip is unhurried and the fish turns back down well below the rim. Escapes happen when the trip is not calm: a panda startled by a net, a sudden shadow or a tank mate's lunge can launch with enough speed to pass through a feeding hatch or an uncovered corner. The other cause owners miss is frequency. A panda gulping every few minutes is not playing; it is compensating for something in the water, and a lid without a diagnosis leaves the real problem in place.
Close the top, including the small openings
Fit a lid that covers the full footprint of the tank and then audit the edges: gaps around filter pipework, the slot for cables, and corners left open for ventilation are exactly where a small, slim cory exits. Mesh panels or cut acrylic pieces close these neatly while keeping airflow. Because pandas are small fish, openings you would dismiss for a larger species are genuine exits here. Make a physical check part of closing up after every water change, plant trim or filter rinse: lid seated, hatch latched, corners covered. Most cory escapes are found after maintenance days, which is not a coincidence.
Read frantic gulping as a water signal
Test ammonia, nitrite and nitrate whenever surface trips multiply, and correct anything that is off with water changes, since pandas are among the first fish to suffer in a slipping tank. Warm water holds less oxygen, so in summer or in a warm room, add aeration or surface movement and check the temperature has not crept up. Keep the substrate clean without stripping the tank: pandas forage face-down in it all day, and a neglected bed irritates their barbels and adds to the waste load. A group of pandas in clean, oxygen-rich water still gulps, but at a leisurely pace, and leisurely gulps do not clear the rim.
Set the tank up so nobody panics
Keep pandas in a group of their own kind; a lone or paired cory is a nervous fish, and nervous fish startle. Provide sand or smooth fine gravel they can sift without tearing their barbels, low caves and plant cover near the bottom, and tank mates that do not swoop at them. Dim, sudden movements around the glass settle once the fish learn the household's rhythms, but avoid tapping the glass and netting fish after lights-out when the school is resting. If one panda keeps launching while the group is calm, look at that individual: laboured breathing, clamped fins or loss of the crisp panda patterning warrant closer observation and advice from a vet who treats fish if it worsens.
Make the lid check somebody's named job
The pattern behind most escapes is a lid left ajar by a person who meant to come back to it. Giving the check to a named member of the household, at a set point in the evening routine, removes the ambiguity. In KinsLe, Care Teams lets you assign that lid-and-gap check for the panda corydoras tank as a recurring duty, with completion marked by a timestamp, so everyone can see the tank was closed up properly rather than assuming someone else did it.