shrimp will find tons of food that would be missed by fish. what fish are they? are they capable of eating the shrimp? shrimp are sensitive, and sometimes dont cope witha a change of tank too well. do you know what species of shrimp you have bought?
also shrimp are very good at hiding, i have a large colony of red cherry shrimp in one planted tank and they are difficult to spot many at once and they are bright red
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