I am far from a treatment expert, you will find my treatment questions more often than answers in this section. If the black sponges are carbon sponges and are fairly new, they will be able to remove some of the ich treatment so removal would be a good idea. The bioballs need to stay in the filter to keep your fish fairly safe from ammonia and nitrites, no point to compounding your troubles with water quality issues. Removing the ich treatment after the ich has gone from the tank can be done using carbon but it can equally well be done with large water changes if you don't have any carbon to use.
You don't say what the active ingredient in the house brand ich treatment is. Chances are it is something like malachite green but who knows without reading the label. If you can publish that active ingredient, it will help the real fish disease people give you treatment hints. The only thing I have used in the last 20 years for ich has been a salt and heat treatment so I can't help much there. Right now I am having my own trouble with my favorite breeding molly and have my own thread running in this area to get input from people like Wilder myself. My experience with disease is that if I can't prevent it, I will lose some fish.
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