I find that if you keep the rockwool in the black plastic tray they come in then they seem to root faster, it keeps the moisture in, stops mold growing from light hiting the cubes and promotes the roots to pop out as strong light kills them.

As pharma said it's about what works for you, but it looks like your clones are developing fine I wouldn't go about breaking up the cube tho :thumbsup: Goodluck man i'm sure you'll do fine.