The problem is, he didn't really get it down, it has been hanging half out of his mouth all night. I don't know if he can swallow it or spit it out. What can I do? Or will he eventually unwedge it.
thats actually a really big problem. the pleco is stuck in it's mouth and if it was in the oscars mouth all night, consider yourself lucky it's not dead yet. it needs help getting it out and you have to provide it.