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Did you find all fish that died? One decomposing somewhere might be enough to spike the nitrates.
High nitrates on their own are not immediately and directly dangerous to fish. Ammonia would be the thing to be concerned about.
The new, not quarantined fish dying first and the one-by-one deaths of the established stock is pretty consistent with Velvet/Amyloodinium.
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Pairs: 4 percula, 3 P. kauderni, 3 D. excisus, 1 ea of P. diacanthus, S. splendidus, C. altivelis O. rosenblatti, D. janssi, S. yasha & a Gramma loreto trio
3 P. diacanthus. 2 C. starcki
Current Tank Info: 200 gal 4 tank system (40x28x24 + 40B + 40B sump tank + 20g refugium) + 30x18x18 mixed reef + 20g East Pacific biotop + 20g FW +...
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