ah ok, i know nothing about birchir tbh, assumed only a few got large enough to munch a 6-7 inch fish.
If he has multiple heavy hitters. If one grabs and the other grabs on aswell, theres nothing left but shreds.
Nic's are pretty cool. I dont see why not.
I keep green severums with mine but they are hit or miss on being plant friendly. Mine are not.