Snowflakes are notorious escape artists - any opening big enough to fit their small skulls through is big enough for them to get out. Bird netting might be small enough, but could be pushed aside or, worse, cause the eel to get stuck if it tried to push through it.
They will eat shrimp and crabs. They mostly ignore fish, but sometimes become aggressive when they reach adulthood. If that happens, they are a risk to even bigger fish.
Zebra eels are a much safer bet over the long term, but do get bigger than snowflakes. They will also eat crabs, I think.