My orchids are dying!

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I have three orchids and they are all dying. The blooms are falling off of one and the bottom leaves have turned yellow. The other has it's main stem turning yellow so I am afraid the shoot from it will die before it blooms. Help!! Any suggestions to what I am going wrong, I water them once a week with three ice cubes, saw that on tv once.
my orchids are dying, gardening
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