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.
A cultured sponge filter works well in discus aquariums. If you donât have the time for the filter to naturally culture, you can use a bacterial starter culture to speed up the process. Either method will work fine, just make sure that the tank doesnât have excessive water flow. In nature, discus fish live in. calm water, so do you best to mimic this. You can keep discus in a completely bare tank, but I usually put a thin layer of gravel on the bottom.