The honest answer for amano shrimp: independent
Amano shrimp are independent animals, and expecting affection from them misunderstands what they are. An amano shrimp has no social bond with a keeper, no interest in being watched for its own sake, and no capacity to miss you while you are away. Its world is organised around grazing, safety and moulting. That is not a failing in the animal; amano shrimp are engaging precisely because they are busy, purposeful scavengers whose behaviour is readable once you learn what drives it. An owner who stops waiting for affection and starts reading feeding and moulting signals gets far more from keeping them.
Why amano shrimp rush the glass at feeding time
The behaviour most often mistaken for affection in amano shrimp is the excited gathering when food arrives. Amano shrimp detect food in the water column quickly, and a group that has learned the routine will converge on the feeding area, climb plants toward the surface, and compete for the best pieces. Individuals routinely grab a pellet or a chunk of vegetable and swim off with it clutched underneath, eating while they travel to a quieter spot. This is learned food anticipation, sharp and reliable, and it is genuinely interactive to watch, but the shrimp would perform it identically for any hand that feeds on schedule. The association is with the meal, not the person.
What amano shrimp behaviour does tell you
Independent does not mean unreadable, and amano shrimp communicate their state constantly through activity. A content group grazes steadily across wood, stone and plant leaves, picking at biofilm with their small claws in an almost continuous motion. Females carrying a saddle of eggs, and later a fan of greenish eggs under the tail, are settled enough to breed behaviour even though the larvae need brackish water and will not survive in a freshwater tank. A shrimp that hides for a day or two is very often freshly moulted and soft, not sulking or ill, and the empty shell left behind is a sign of growth, not a death, which startles many new keepers. Shrimp bunched at the surface or hanging at the filter outlet, by contrast, can be signalling low oxygen or a water problem, and that pattern deserves a test kit rather than interpretation.
Building your side of the relationship
Since amano shrimp will not meet you halfway socially, the pleasure of keeping them is in providing the conditions their behaviour rewards. Dense planting, moss and wood give them grazing territory and moulting cover, and a group kept together behaves more boldly than a lone shrimp in open water. Feed them where you can watch, vary the menu with blanched vegetables and shrimp foods alongside the algae they harvest themselves, and resist tapping the glass or netting them out for a closer look, which registers purely as a predator event. Over weeks, a settled group grazes in the open through the day, and that relaxed visibility is the closest thing to trust this species offers.
When amano behaviour is a warning, not a mood
Treat a sudden change in a previously active amano shrimp group as information about the tank, not the relationship. Shrimp that stop grazing, sit motionless in corners, attempt to climb out, or die shortly after a water change may be reacting to a temperature swing, a contaminant such as a plant treatment, or medication containing copper used elsewhere in the system. Test the water, review anything added to the tank in the previous days, and act on the chemistry rather than waiting for them to perk up.
Learning to read grazing, moulting and feeding rushes turns an independent shrimp into a surprisingly expressive tank resident, and KinsLe's Kinny is there in the moment when a behaviour puzzles you, with what you have already noted about this group kept alongside their profile.