Several methods.
1. After dark. Let the tank and room lights be off for about half and hour at night. Then turn on all tank lights and immediately try to net it.... if it doesn't not have a habit of hiding during lights out, in the first place. The sudden brightness will temporarily blind the fishes for just a few minutes. This I haven't tried myself, but mentioned fairly frequently n the forum.
2. Two nets... one of my preferred methods, even for SAE. A small one for herding, a large one as a trap. The large one, place it diagonally against against the glass, one side touching the glass and the bottom near to or touching the bottom. The other net, use it to herd (not chase) the fish to the front of the tank. Then try to herd it between the front glass and the large net... you know what to do next.
Herding means you move slow... the fish will try to sneak away from the small net. Where you place the small net, can sort of determine which way the fish will sneak. Chasing it will cause it panic and dart.
Top view of tank.
Code:
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| \ |Front of tank
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| Big \ |
| net \|
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3. Fish trap. 500ml drink bottle. Cut of the top, re-attach it reversed. Make sure you can easily unattach it again.
Put food inside, submerge it, wait. You will end up catching alot of the other fishes too, but once the CAE goes in, lift it out of the tank, remove the CAE, and return the rest of the fish.
Fish trap. Hopefully, you can figure out what I'm trying to show.
Code:
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