I use plants in my wet/dry filter. Unless you have a lot of them you will not get great results however they are better than nothing. Bogwood (preferably not from deforestation ) helps as well. AmQuel Plus helps with ammonia nitrites and nitrates. 20-30% water changes per week! None of this will work if you are using tap water with high nitrates. So you're chasing your tail. Find a friend with an RO unit and bum some water!! It can take months to fix. Zeolite removes ammonia and nitrates if left in for months. Research zeolite....good luck