Nitrates shouldn't get past about 40. So you need to take care of that by doing a water change, about 25% every week till its back under control.
Are you mixing your water ahead of time? Declorinated tap water or RO water?
Also what are you feeding your fish? You should be feeding garlic soaked, vitamin enriched mysis and hopefully your clowns will come around. If you have a picture or video of them that would be best to help find out whats wrong with them.
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