Do you have corals? If so, you could be harming them if you cut back on feeding the fish. Ammonia is the only sure way that corals get nitrogen. Some corals cannot use nitrate and those that can use nitrate have to convert it back so ammonia at a high energy cost.
You have high no3 because you have not completed the real nitrogen cycle. Cycles never end and they certainly are not over X days after adding bottled bacteria. Plants, physical export or anoxic bacteria turn no3 into N gas - this required undisturbed sand or effective rock (usually real live and not dry/dead at least not for a while). If you have a good skimmer organic carbon dosing can lower nitrate, but there are risk - Dr RFH has good artilces on this and you can use vinegar, vodka or sugar and not have to buy a bottled reef product at quite a high markup.
