I saw it in the 90s. Could have been a 70s-90s sci-fi horror movie or an episode of a series. The story played out on either a space ship or in some sort of a planet base.
I remember only the tentacles, not sure if the rest of the alien was depicted. However the tentacles were multiple, very fast moving, no thicker than 3/4 in or 2cm. The victims were enveloped in them and the tentacles tightened on its victim like the rubber bands on a melon. The protagonist(s) were shutting the doors to block it from moving from compartment to compartment.
It was memorable for the absolute dread it caused in me so I doubt it was one of those light hearted- slow paced sci-fi series from back in the day, but I might be wrong. It's been a while.
I looked through every single thread about tentacle aliens in here and could not find anything matching that description. I'd really want to rewatch that thing as it's been hunting me for over two decades.