xweeqtx
Fish Addict
it was my understanding that if you have an unfiltered tank for a betta there is no need to cycle (obviously, as its the filter that you cycle) but that if you do decide to use a filter, then you do want it cycled, otherwise it doesn't do its job properly. so as the tank has a filter it could be worth cycling it.
but i could be wrong.
The filter will still "filter" the water, and keep it clean but it doesn't have to be cycled for a betta. I have never completely understood why, other than they don't like a filter flow in the first place. Perhaps they are "immune" to the effects of ammonia etc that are deadly to other fish.
Cycling a filter is to create good bacteria that will keep you're water healthy and free of the bad bacteria, so since a betta doesn't need a filter, it doesn't need to be cycled.
Really there is no need for a filter in a 5gal betta tank, keep up you're water changes every second day and do a 100% clean every week and you'll have a happy betta, with both clean water and no filter flow.

ETA: Although I will stress that you continue using water conditioner etc, its still vital because of chlorine levels etc.