i have one now, well its for sale in the classifieds section, had it for about 18 months and its about 2.5 inch, fully grown, they do come from fast flowing streams with a high oxygen content and generally a bit cooler than your average community tank. though saying that mine has lived happily at about 27 celsius for as long as i've had it and as you can see if you look at the pictures its in perfect health. they can be a bit aggressive, with other bottom dwellers, it chases the corydoras and really attacks the frogs, but apart from that they are really good looking fish and are very active, you will always have to make sure food is getting o the bottom of your tank.