New Catasetum question...

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Do they have big sets of leaves now, or are they leafless and dormant?

Water them if in leaf. Don't repot them when in leaf if at all possible. Wait until full dormancy to repot if you can. The best time to repot is when a new growth is just emerging and has very short root nubbins - but don't water until the roots are very much longer.

Study the link fishmom gave you. These can be harmed if watered at all, or underwatered, at the wrong growth stage.