Have you tried taking them back to the store where you bought them? I know some of the stores here will take them back if they are not sick. I had to return some who turned a little aggressive to my other ones a couple of years ago. Your algae eater is probably a Pleco.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!