Could it be Dragon's Domain, a Space: 1999 episode? The original air date is 23 October 1975.

It features an octopus-like monster with a single brilliant eye, nearly unkillable, that ate people and spat out corroded corpses.

The Alphans' uniforms are white, and they wield handheld lasers.

I distinctly remember watching the scariest scenes from under a blanket :-)