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It's not necessarily the food you're putting in that is overwhelming the bacteria. Those fish produce a lot of waste, even when they're not eating.
Ammonia is being constantly added to the system through respiration alone.
Again, get your salinity up. Test your new water.
If you cleaned it as well as you say you did, one 50% w/c should cut your pollutants in half. I wouldn't go that big that fast if they are dangerously high, but you get the idea. Maybe 25% every 3 days until things are stable.
The bacteria ARE turning nitrite into nitrate. But for some reason they can't do it fast enough.
What are your nitrate levels?
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