Dudes, I baught 2 females from petco about a month ago (not my current ones either) and they came home that evening. One dyed the next morning. The other squirted out stringy white poo for a day then died too. It killed my favorite male guppy (who I wanted to have babies so I could keep his genes in the future when he got old, and now can't) take that into thought for a few seconds.
Now, when I was buying plecos for the first time ever. I (very very sadly) killed one a few days after I got it. The petco said my tank needed to cycle first and sent me home with 3 male guppies. I cycled the tank and came back for another pleco. The sales lady INTERVIEWED me and in there I told her I had 3 black skirt tetras, 3 guppies, a 10 gallon tank, and it was cycled. She sold me the pleco. Killed it within a week. Holding onto hope, I got the fog out of my water again, went to petco, and did the SAME interview with another lady, and she sent me home with another pleco and three black skirt tetras (the first three died cuz of the pleco) it died again, we went to the peco again, and there was a guy there this time, we went through that same conversation again, and he told me that I needed to wait untill algae grew so my pleco could eat it, and that was why they were dying. We waited three weeks, and there was another lady there (she was old) an we went through that exact same conversation again (don't forget that I told them I had a 10g every time) and this lady FINALLY knew a minuscule amount about plecos and explained that I needed algea discs. That's when I brought Oscar home, and he has lived happily and healthily and I wish he could for longer and I wish I could find him a nicer place to live!
NOW, after hearing this story, do you understand why I don't want to give him back to the petstore? And at all the other petstores (Walmart, petland, petsmart) there are so many dead fish in the tanks that we only buy plants and chemicals from those places! Now PLEASE stop telling me to give them to a pet store, because his death there will be much much worse! If I could leave him there safely, I'd've done it a long time ago!
And I'm sorry for sounding angry, but I felt like I had to make this point because telling you in a calm voice probly wouldn't've worked.