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Nitrite
Aquarists' concerns about nitrite are usually imported from the freshwater hobby. Nitrite is far less toxic in seawater than in freshwater. Fish are typically able to survive in seawater with more than 100 ppm nitrite! Unless future experiments show substantial nitrite toxicity to reef aquarium inhabitants, I do not consider nitrite to be an important parameter for reef aquarists to monitor. Tracking nitrite in a new reef aquarium can nevertheless be instructive by showing the biochemical processes that are taking place. In most cases, I do not recommend that aquarists bother to measure nitrite in established aquaria.
Ten dorsal spies like the entire dorsal fin like both the partsIt might be percula hard to tell, percula has 10 dorsal spines and ocellaris has 11.