pleco food

This might sound silly but could a pleco just survive on vegetables such as cucumber, lettuce, spinach, cabbage etc.(these are the ones I've fed to mine pleco) without any special pleco food and algae wafers...

I am convinced my sailfin pleco is carnivorous he is around a foot long 12inch and I never see him feed He is nocturnal 100% it’s a very rare moment to see him with lights on even at his size I drop 2-3 algae wafers in a day and he never eats them my cory do my geophagus do but not him , he...