I dont have the heart to get rid of the pleco he has been in there since 2" about 5 years ago and now is like 18 inches, more poop than anything but hes worth picking up after you could say
yes they usually will just pull them up just because they can LOL....
I added another sponge filter to my O's tank and he would not leave it alone and really looked pissed it was in there until I took it back out. I swear those fish can actually show emotions in their facial jestures....