I have a mini pleco in my tank right now. I bought 2 of them in Febuary after the one I had for 13 years died, : ( They were both about 2 inches long, now 1 of them is 6 inches and the other is still 2 inches! He is SO cute! They are both common plecos and after looking on the internet, I Found that there are actually dwarf plecos! Who knew?