In North Dakota's Bakken formation, the break-even cost has fallen into the $20s in some counties, the state's Department of Mineral Resources reported last month. Producing a barrel of oil would still be profitable at $24 in Dunn County, down from $29 last October.
You can exclude this risk. Water temperatures and influence on fish behaviour Normal temperatures for keeping discus fish lie at 29-30 Â°C. If your fish are too calm and do not eat greedily but are hesitant about eating, raise the water temperature for c. two weeks to 33 Â°C. This will raise the metabolic rate of the discus fish and encourage their appetite and their sense of hunger.
On a more serious note, plants are known to act as chemical filters to help remove toxic substances from the water. This is a very important attribute for a discus tank. Discus are sensitive to water quality and they place more of a demand on the aquarist to maintain high standards. A good collection of healthy plants will lead to a healthy overall environment and will help stave off common diseases like hole-in-the-head. Plants also provide natural hiding places for discus.