Sometimes in fact often one parent will become dominant, especialy feed wise. providing that the dominant one is providing enough Mucus for the fry you can remove the other.

When you say Driftwood do you mean fresh water wood or Bog wood ? If wood is found on the Beach or a pond be wary. Bog wood will lower the Ph gradualy but you will need plenty of it, as the tannins leech out the water turns tea colour. after some time it just becomes like any other wood as it is not replacing all the elements you woud find in a Bog.

I think I meant bogwood, the brown stuff they sell in the shops. Just wanted to make sure it wouldn't cause a rapid PH change. Thanks.

bogwood wont cause a rapid ph change, bog wood is a slow process. if you have very low KH then i would monitor your water. Otherwise dont worry as your KH will buffer the PH.