If you want to keep money plant as an indoor plant, it is fine to go for a small pot. But always prefer a harmonising pot outdoor for a faster growth. The growth of the plant is closely related to the pot size. You can plant it directly to the soil also without using a pot.
Calcium deficiency causing white spots on nails is the most common myth, followed by zinc deficiency. The truth is that white spots are common and harmless and don't indicate any specific vitamin deficiency at all.