Putting several orchids into the same pot is not the best idea, as that provides and excellent way for them to share pathogens.
Instead, consider individual pots placed in a larger basket of other container, surrounded by decorative moss or something.
I commend you recognizing that you ought to slow down. The three different types of orchids you currently own each have their own cultural demands, and growing them together is not likely to be successful. Stop here and see how they do in your conditions, and it will provide a guide for future acquisitions.
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