How you grow orchids all depends on the climate in which the orchids are grown and what orchids you are growing. That is why you will find so many different suggestions on what to do with them.
Basically, increasing temperature, air flow, and light will increase the need for water for most plants. Also, if your cattleya isn't putting out new growth, it might be at rest and will need less water. When it is in rapid growth, it will usually need more water. However, too much water will cause the roots to rot.
Living here in Ohio, I prefer giving my orchids, including the cattleyas, good air flow around the roots so I plant mine in plastic vanda basket/basket/net pots, and use red lava rock as a medium. I have a few that are mounted, too. Just depends on the type of cattleya and what type of environment you can offer your orchids. Good luck@
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