Just do your own research before buying anything from here. They seem to be too happy to make a sale rather than explain that your purchase will end up ruining something that was fine before. I had some algae growing so I went to get something for control. I was told that 3 inch plecos will do the trick along with a snail.
Long story short,
my goldfish (who have been very healthy since I bought them a few years ago) started bottom sitting and I noticed scales missing all over them. I was clueless because I checked all the levels and everything was fine. I figured it had to have something to do with adding the newcomers, maybe sickness.
After a quick Google search I find out that plecos have a taste for the slimecoat on goldfish. This resulted in two dead goldfish ( my 2 toddler sons didn't understand this) and an awful lot of trouble that would have been unnecessary had the employee been honest and at the very LEAST let me know that this is a possibility.
I called to let them know and her excuse was there must have been something wrong with my fish prior to adding plecos because plecos are fine with goldfish. Just do a quick google search and you will see that in fact this is common and it is recommended that plecos not be placed in a freshwater tank with goldies for this reason. All I ask is that they be honest with people and at least inform them of this before the sale. This is the way it went for me. I went to this shop with a tiny, easily fixable problem and ended up with two dead goldfish, the rest bottom sitting with missing scales and a lighter wallet over something that most aquarium specialists already know about.