Question

is bacillus is aerobic or anaerobic nitrogen fixer

Answer 1

Facultative organisms, which are able to grow under both aerobic and anaerobic conditions, generally fix nitrogen only under anaerobic conditions.
For anaerobic nitrogen-fixing bacteria, oxygen does not pose a problem, because it is absent in their habitat.

therefore it is an anaerobic nitrogen fixation.

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Answer 2

Bacillus may be aerobic or may be anaerobic.

Explanation:

Bacillus is a gram positive bacteria which is rod shaped structure.

Bacillus species can be obligate aerobes which is oxygen dependent or may be anaerobes which have the ability to to respire in absence of  oxygen.

Bacillus is a nitrogen fixation bacteria that helps in fixing nitrogen biologically.