They are 13 weeks old but I can't attach photos as I don't have permission? [emoji30][emoji30]
Start keeping a close eye for hormonal behaviour as I've known it to begin showing around this age.
(I've had one spayed at 14 weeks, the other spayed at 16 weeks).
If they do begin getting overly dominant and begin to fight I'd suggest separating them with a mesh wall or similar so they can still see & smell each other, they can't just hurt each other.
It doesn't normally get to this point but something to keep in mind.
In terms of food, you can always hand feed them pellets to ensure they're getting equal share of those. Give extra boxes of different hay types so they can always get access to hay. You can also hide veg within trays of hay so it gives them a more equal opportunity to get food.
In terms of behaviour, I often find with a F/F pair that one female is more reserved. Time will be your best option here as they're settling in and the new surrounding may be making the more quiet one a bit more reserved than normal.
In terms of pictures I think there may be a time to wait until you can share them - not 100% sure. Sorry
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