I don't have personal experience with this filter but I have some knowledge of it from board discussions as it is a fairly common filter used by some FW plant people.
It won't affect the oxygenation of the water one way or another.
This filter can hold different types of media. Assuming it is holding a type of biomedia, if there are ammonia problems I would suggest seeding the filter with media from a cycled filter. For example a few bio-balls from someeone's wet/dry, or even a chunk of foam from someone's cycled AquaClear or sponge filter. This way the filter will cycle faster.
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