I have some discoloration happening to OB5,more pics in week 6. Started first on few old fan leaves with yellow & brown/purple patches and now is occurring to the several of the colas and is spreading to more fan leaves. Water pH may have been in the 5-6 range last week. HlpPlz
The purple is natural. The yellow is from the plant sucking the nutrients out, which to is natural. Eventually some fan leaves will yellow and fall off. No worries
It seems that you need to give it more water each day, or water more than once since your leaves are dropping at the end of the day. The purpling seems to be natural, not a deficiency.