+1 for just do more water changes! You WILL get them down, or your test kit is broken. Or you are introducing more nitrates with the water changes, because your source water has nitrates.
Every time you change 10 gallons out, you are cutting the nitrates in half unless your source water has nitrates in it. You can easily do a test on your 'fresh' saltwater to test that out, but it should not have nitrates in it. Even with a nitrate reading in the hundreds, water changes are all you need to do because the tank is so small!
Your corals might be dying from lingering copper from the medication you used to combat the ich that wiped everything else out. You might want to look into getting either a copper test kit, just to rule that option out. Or see if any local reefers can loan you one!
Finding out why things are dying is more important to me.
When you say it 'normalized' what are the actual hard numbers? What was it before the ich die off, after the ich die off, where did it normalize, where is it at now...?
Real numbers and knowing your other tank parameters in actual numbers (Not 'its normal' or 'they are high') really helps to pin things down!
Also, are you using a RODI for your water changes, or tap water?
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