As long as your Phals have a healthy root system, and as long as your medium is airy and fast-draining, and as long as you keep a close eye on the moisure level, they should do just fine. I really like those slotted clear plastic pots for my Phals. I've got a few of my larger ones in the five-inch size, and they do fine. In fact, they are growing and in need of a repot, but it's hard to find that exact kind of pot in a larger size. One thing you may find is that the roots will end up growing out both the bottom holes and the slots on the sides, so when you need to repot again, you'll probably have to destroy the pot by cutting it away so as not to break the roots.
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Cheri
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