I think you'll be okay, the difference is negligible imo. You'll work out the best way to hang them when they're up and running..using any more intense light to your advantage.
Ferret shit is the usual here in the UK...works a treat. Some (most?) zoos sell their lion/tiger shit etc for this very reason. Worth checking out simply for the coolness of the solution imo (:
Can't see with that pic, but carry on and it may be clearer in a few days. Cetainly to early to bin them imo...
But first pot up those girls into individual pots :wink: