Is a snowflake eel clam safe?

My new tank is/was working out very well. It is a 5'x24"x16" liner tank, all plywood and rubber liner. It is connected to (via overflow) a 75 gallon that was to be for a few small fish.

The liner tank was to be for coral, algae, and critters, essentially a refugium. Until I bought a snowflake eel for the 75 gallon . All was well, until the night before last.

I was doing my normal routine, cleaning skimmer, changing water and cleaning the overflow. In doing so, I removed the plastic screen I cut to fit the overflow, knowing the eel would love to find its way out, and forgot to replace it after cleaning! The next day, guess where the snowflake was/is!

I removed all the Chaeto from the liner tank and placed it into the 75 gallon. I also placed a few more live rocks in there as well (in hopes of saving my tiny invert collection!). In each tank there is about 65 pounds of live rock.

There are many snails, ... more.

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