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i posted this in cichlid central but figured i'd have better luck here.
anyways i have a 70g tank with a male and a female convict that are about 2-2.5 inches. I noticed both of them acting very stressed(not eating, not active, staying in the corners or hiding). iv'e had them for about a year and never seen behavior like this. there's also a pair of firemouths that are about 2-2.5 inches in the tank along with a yoyo loach, upside down cats(3) and a common pleco.
i haven't changed anything in the tank recently, filters are clean, nitrates are fine, ph is fine. any ideas or solutions would help, thanks

Im sure people will ask -

What are the Ammo levels, Nitrite levels, and although your notrate levels are good, could you post them?

nitrates are at about 20
nitrites are .2-.4
ph is at 6.8

i don't have an ammonia test at the moment, i'm planning on taking some water to the lfs to see what they think also.