How hardy are fiddler crabs with elevated nitrites and nitrates?

[TheBasementNerd]

Ok so cause I shouldn't risk it with my literal favorite critters, how hardy are fiddler crabs with the water? I'm getting them today because shipments are REALLY dicey atm so no idea when they'll be back in stock, but the nitrates and nitrites appear to still be really high. Since I'm setting up a properly half land system so they won't always be in the water, will they be ok? Or will they die and get hurt from the water being high in nitrite/nitrate

 

[Cheesecake]

They should be fine. They're usually super hardy little dudes.

 

[saltwater60]

How high is high and why not just do a water change to lower it so there’s no stress on you or them. I’m sure they can handle some.

 

[TheBasementNerd]

How high is high and why not just do a water change to lower it so there’s no stress on you or them. I’m sure they can handle some.

Because have done 3 water changes in a week without it going down is confusing me. I have clean tap water, I've tested. Also, when liquid or strip testing the color shoots to max immediately, that's how high