Help!! Catch fish in overflow

[sphelps]

I usually clog up the standpipe for a few seconds until the tank it just about to overflow then pull out the standpipe, this usually flushes them into the sump where I have a net waiting at the input.

I discovered that trick when I was in a similar situation but with a ribbon eel and a really small overflow, you could get the smallest net in their but you can't use it to catch an 2' eel