New Here! Advice Appreciated

[PrincessTiel X]

Hi, I joined this site because I have myself a Lovely Pair of Cockatiels! The first I'll mention is a Male Pied with no other mutations present visually. He's 7 months old this month & he is currently going through his 1st Molt. His Future Mate is a Gorgeous 2.5 to 3 year old WhiteFace Pearl-Pied Female! (Don't know her exact age, but I am certain that she is fully mature.) The Breeder I purchased her from estimated her to be over 2 years old. They are each from Different Breeders, and Charlie loves Princess. I feel as though he'll have no troubles mating her at 9 months old (In May) And I have already set up a breeder box, though I may need to put a lid on it and also buy a Brooder. I am prepared to do those things, and will be encouraging them to mate shortly.

They Both look Healthy, and Princess is by no means a chronic plucker. However, my mother is worried because she will occasionally pull a loose feather. I told her this is normal (for context, I live at home because I am physically handicapped) Am I right? Is it Normal?

There is one more small thing. Lol. Both of their Vents Look slightly dirty. Does this indicate sickness, or do they just need a bath? We've never bathed or spray bottled them at all. Thanks, guys.