If the food you add into a shrimp tank is not all eaten up within 1 hour, then it is an indication that the shrimps already have sufficient natural "food" and bio-film in the tank to graze on, so you don't need to feed them as much. Individual shrimps don't actually need that much food to consume and grow, even more so with only that few shrimps in the tank at the moment. Its mainly in tanks which house much larger populations of shrimps that usually need more supplemental feeding (like in LFS tanks).
Hungry shrimps will jump on food immediately and finish eating it very quickly, shrimps which are already full will tend to ignore food even if you feed a variety of it, so no point trying to keep dumping in more and more food.
Any leftover food in the tank is a sign of overfeeding and the uneaten food will just rot and pollute the water. Shrimps that are overfed will also produce waste that contain more undigested food, which pollutes the water even more.
Spread out the feeding frequency (ie. try only once every 2-3 days or more) and reduce feeding until you see no more excess food in the tank, then that is the feeding level and frequency you should stick with. Just have to experiment and see.
In my own shrimp grow-out tanks that have established plants and algae growth, i only feed my shrimps once or twice a week, and only in very tiny amounts. The rest of the time the shrimps graze on algae and bio-film in the tank and they still grow and multiply.
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