What is high nitrates for inverts

[Dra49ers]

Okay I’m trying to stock up on some cleanup crew but keep running into high nitrates are fatal or does not tolerate nitrates. Mainly aimed at snails, urchins, conchs, and serpent stars. What exactly is considered high nitrates for inverts? I’m running a softie and euphyllia reef no3 ranges 10-25ppm. If too high what should my cuc consist of. Thanks

 

[reefz]

Ive had inverts in 40-50 nitrates when our skimmers broke. Snails and hermits can push through. Shrimp can be a lot more sensitive.