Looks like Peckoltia or Ancistomus to me. Which one specifically? Can't say for now.
I'm assuming these are wild-caught. Do you know which river these came from? No. 1 looks female. No.2 definitely male. No.3 female perhaps. 4 and 5 potentially males. Give them time to fatten up or grow more pronounced odontodes. Then sexing will be very easy.
They were sold as L075 sabaji's but when I compare to the other 75 I have in another tank they look nothing alike, yes wild caught but unsure on the catch location.
more than happy to get more photos if any are needed.
Cannot be mistaken for a Sabaji. Nevertheless, you got yourself something that's rarely exported in my opinion. Could be Peckoltia sp Rio Nanay perhaps?
These have bred before I'm told, video of the eggs and babies is quite blurred though so a little sceptical but going to try non the less, the mouth has a presence of fine hair thick internal teeth.