Guppy - +3 and -2

I bought 3 more on Saturday,but yesterday,died 2 ady..T.T
one stuck under the rock...WuuuWuuu...
and another,when yy found her,i frightened by her..
she jumped out and died on my table and no moving and dry ady...
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As a conclusion,it is not easy to rear Guppy!!