Snowlfake Moray Eel (Echidna nebulosa) gets trapped in aquarium filter - how?

[Jheuloh]

-Snip- So, my marine biology teacher's snowflake moray eel somehow got itself in the filter, how could it have gotten in there?

Edit: Today, it was revealed that the eel had crawled up into the filter on its own (though apparently would have otherwise been trapped in their, just that it wasn't "sucked into" the filter, as previously believed.)

Thus, I ask more experienced aquarium keepers - are there filters out there designed to disallow animals from potentially entering the filter systems?

 

[mteem]

Nope. Got to Lowes or Home Depot and get plastic gutter gaurd and attach it to the out-put of the filter. I had one that did the same thing. The gutter gaurd works great.