Three years ago I bought a common Pl*co from pet smart, being told he was an excellent algae eater and would not get too big. I put him in a 5 gal tank and he soon outgrew it. I bought a 20 gal and put him in that. He has now outgrown that. He also is terror on my plants and poos alot almost making more mess then he could possibly fix. Since I do 20% water changes twice weekly and test my water just as often. I have been very sadly trying to figure out what to do since I cannot afford a larger tank and he is really a nice fish with much personality. Well, this brings me to my solution, Today I called a lfs that is small and family owned for many years. They said this is a common problem, as we all know, and that they would take my Pl*co in trade for a new small one and then they would sell mine to someone who wanted a big one. I would then every few years trade out Pl*cos. Therefor always having a great fish and never worry about how big he will get. aThey will make a small profit off my Guy and I will still have a Pl*co. What are your ideas about this? And is this practice common?