I recently purchased a Queen Arabesque Pleco, and it literally has not moved in 4 days from the moment it went to the aquarium. It is still breathing, but it has not eaten anything. I am perplexed about what could be the cause, and I am honestly at a loss what to do. I have dosed stress guard every day, but still no reaction. Any help or advise will be greatly appreciated because this pleco was not cheap at all.