My tank was recently cycled (up for 3 1/2 weeks)and 200 lbs of live rock cured ammonia levels are 0, nitrites are .015 and nitrates are 12. There is some diatom action and very small areas of hair algae. I want to go buy some blue leg hermit crabs and turbo snails to help eat some of the algae. Can they withstand the levels of nitrite? Thanks