Oscar being lethargic and not eating

Hello All,

I noticed about 3 days ago my Oscar started acting lethargic and is not eating. I do not see any obvious signs of disease or anything like that. The tank chemistry has been consistent.
Ammonia = 0
Nitrites = 0
Nitrates = < 40ppm
pH = 8.2 (I know this is high for South American cichlids, but it has been this way since I started the tank around christmas and this is new behavior so now about to drastically modify pH when they have been thriving.

I did a 30% water change yesterday and plan to do another change tomorrow. Anyone know of something else I may be able to do?

Thanks in advance.
Water change,90% bring the nitrates down below 10,he may be getting nitrate poisoning.

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