max. nitrate for mantis shrimp

close to zero as possible. Some species are more tolerant, like G. smithii and can withstand pretty bad water. O. scyllarus is more fragile but is still very hardy. in short, most mantids can withstand fairly bad water (better than corals for example) but you should still strive to keep it near zero as much as possible. I would start getting worried at 10ppm.
 
Like Justinl said, it really does depend on the species. Me, I'm a bit more lenient than that though. I keep a p. ciliata and my max is tha same as the max for a FOWLR, 40 ppm. I check the water in between water changes once to get an idea of what nitrates are and if they are above thirty I do a quick water change. However the closer to 0, the better and I try to keep mine lower than 20 ppm. And My tank USUALLY doesnt exceed 20 ppm
 
whoooo 40ppm is real high imo.

Tank volume is another consideration. In a small volume Id be more religious and keep to 10ppm or under, just because if there is a nitrogen spike in a small tank its gonna spike much faster than in a larger tank.

I would also consider what else you have in the tank. Mantids are very hardy in general, but what about the other critters? corals for example would not be happy with over 10 ppm.
 
It is pretty high. However I would like to note that, at one point, went up to maybe 50 ppm with no noticeable adverse changes in behavior or activity to any lifeform in my tank. my hermits, snails, mantis, featherdusters, and damsels were all fine and there was no "heavy breathing" from my damsels. Of course I did an emergency 30% water change right then and there. I have a 10 gallon by the way
 
Try to keep it close to 0 ppm not more than 10 ppm, I.M.O. I had an wennera, and i kept the water same as my reef tank.I guess it died of old age. Don't know how old it was when i got it ,It was approx 2 to 2.5 inchs long.
 
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