Cattleya orchid bloom turning black

[SouthPark]

For a case like this, it will be beneficial to describe and show details of the current growing conditions. Temperature range, media used (eg. rocks, moss, etc), pot type (and water-drainage features of the pot), how much water applied during watering, and state of the growing media and roots - eg. moist, dry, very dry, extremely wet, ultra wet/soggy etc...... and air-movement in the growing area.

Show photos of the leaves too. And how long has it been (roughly) since you first purchased those orchids from the show?