Potting two plants in the same pot

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Here is information from a local Phal breeder, now retired, who won many awards:
Eric Goo of Phoenix Orchids: Growing Phalaenopsis

I keep mentioning temperature because most homes are too cool for this kind of Phal to grow to its best potential. They may flower with temperatures in the mid 60s - low 70s F / 20-22C but growth and flowering is far better with much higher temperatures. It had probably been grown in a very warm and humid greenhouse before you bought it, hence the lush flowering.

Phals flower best (quantity, size) with 1,000 foot candles / 10,700 lux of light year round. Increasing it to 1,200 foot candles in late fall for a few weeks helps initiate buds, after which time light intensity should be returned to 1,000 foot candles. Day length is important, too. Eric didn't cover this because he was addressing Phoenix growers, 33 degrees North. We have long enough winter days. Others here have commented their Phals flowered much better with supplemental electric lighting in winter to extend the day to 10-12 hours.

They are heavy feeders. Eric said studies showed Phals in good growing conditions flowered best with 1 teaspoon / 5ml powder of a balanced fertilizer per gallon / 3.78 liters of water, weekly through the year. For home growing, with lower temperatures and humidity than in a warm greenhouse, this would probably be too much. Eric said there's little difference between fertilizers so long as they are complete; he has used 20-20-20 and now uses MSU.