Need help for Identification

[Loewe1402]

Hello Antlovers,

I've found a few Ants (ca. 20) after planting a few plants from the plantshop into my tropical Terrarium.
I think those are Pharaoh Ants, but I dont have much experience with ants.

Size: 2-3 mm
When: 21. February 4 PM.
Where: Terrarium, probably from plants from the local plantshop
Appearance: orange & black
Behaviour: they formed a small irregular track on a stick, 10 cm appart from each other the first day. after that they walked alone around the upper parts of the terrarium. dont know wether there are more on the ground, the foliage is quite thick.
Picture(s): https://imgur.com/a/HVPBxo2

I would be very grateful, if someone could help me to identify the species, the possibility of a queen present and maybe give some information about the possible dangers for my terrarium.

Thanks in advance
Florian

[Loewe1402]

I completly forgot to specify the location:

I'm from southern germany, bavaria to be precice.
the plants i bougth were some small indoor plants, a tiny citrus tree, a raspberry bush and a few ferns. my guess is, that the ants came from one of the latter three ones.