Smaller flowers?

[Jenn4a]

I'm wondering what can cause an orchid (in this case phalaenopsis) to produce smaller flowers, each time a new one opens. I'm pretty sure that it's a cultural issue..

I tried to find some answers, but I wanted to see if anyone else has run into this problem.
So far, I've read that: temperatures are too high, not enough fertilizer, or too much light.

Could the size of the flower be reduced if the plant is also actively growing a new leaf and/or several new roots?
I read that a plant will save the nutrition it receives, and energy for new roots first, leaves, spike, and then buds/flowers last.

Sorry for another dumb question!