They are very awesome! I have a Whisper Internal filter hidden in the background that forms one of the waterfalls. I do 25% water change once a week. In the winter my house is cold so no problem. in the summer I put a fan on top of the tank and add ice to the water on hot days. They need very low current in their water or it damages their gills. All in all they are easy to keep. Most people keep them in full tanks, I like having the moss and plants but it's not needed. They jump so you need a top. They will also eat each other so if you want more than one you have to keep them separated when they are small and only introduce them after they are at least six inches long.