obtuseleaf fissidens moss Fissidens obtusifolius Wils. var. apiculatus Grout obtuseleaf fissidens moss Fissidens obtusifolius Wils. var. kansanus Ren. & Card. Kansas fissidens moss Fissidens obtusifolius Wils. var. marginatus Flow.
Fighting fish that can open their tail fin to verticle like half a circle, they are called halfmoon. Those that can open their fin to more than verticle into an obtuse angle are called fullmoon bettas.
Ideally a more obtuse angle is required that creates a fast current towards the filter intake but the area immediately under the spray bar has relatively little current in it and tends to collect both waste, loose debris and food.
 See also: Water, Fish, Color, Green, Filter
  
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