You say that you will be treating the water with a product. I'm hoping the only product you use on your water is a water conditioner. It is easier than you think it is. I would get a small sponge filter and do only %30 water changes. The only fish that could do fine with %50 water changes is the hardy goldfish. http://bettafishcaretaker.com/filter-setup-clean-water/
If you can stick to those thirty percent water changes and clean your gravel every couple of days.. you will be fine.
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