One of the more expensive types of freshwater fish is the Discus and it is much more difficult to maintain. The pH level of the water in their tank must be kept at a constant level throughout their tank, life otherwise it could result in their death and they also require a higher water temperature than most of the other freshwater fish, of almost 30 degrees. This could pose quite a challenge for any fish enthusiast.
![Freshwater Fish](http://3.bp.blogspot.com/-ubtkHgdm_dE/Tavgw8FGYzI/AAAAAAAAAQk/H-U6I-yU3QI/s400/freshwater_fish_16l.jpg)
![Discus Fish](http://2.bp.blogspot.com/-WJfd1yB7FVE/Tavgw1xRFOI/AAAAAAAAAQc/zOj09Al0avw/s400/discus-fish.jpg)
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