True although I think the little critters will be the least of their concerns

those cockroach/leech type things are rather disturbing though.
I dont think there were any others shown overtly. I think there may have been some others in the tanks but nothing that was shown properly.
What I found rather odd was the stalking behaviour shown by the xenomorph(s)? Especially in the second episode there seemed to be a few instances where they were very clearly following or close by but showed not interest in killing anyone. Which seems unusual.