boosted350z03

I have the pc cooler corona 5 in 1 and also 2 other pc cooler corona fans. The 5 in 1 is 12v and the other 2 are 5v. With the 5 in 1 do I have to hook the rgb to the hub one by one or can I split the rgb with a splitter with one connection to the B450M tomahawk mobo? Also the other 2 fans I have are 5v is there a converter I can get to make them 12v or would I have to get another kit?