Niger trigger with Snails/Crabs?

[sledge760]

I have a juvenile Niger Trigger about 3-4" in a 180 gall. FOWLR. I also have 145 lbs. of different Live Rockin the tank. The rock is starting to grow quite a bit of Hair algae and some cyano. Does anyone have experience with a Niger Trigger and a clean up crew? I would like to add some Mexican Turbo snails and either red or blue legged hermit crabs. Do you think the Trigger will bother the invert's or is it hit or miss?