I had similar problems with you but mine was with 2 golden algae eater.
I DIY-ed a trap out of a 500ml mineral water bottle. Basically, cut 1/3 off the top of the bottle so you have something that is shaped like a funnel. Invert it and slip it into the remaining of the bottle with the cap off and your trap is complete!
You need to weigh them down though, so you could place a rock or something heavy inside the bottle. I attached mine to a fishing string too so that i can retrieve it easily.
I just drop mine into the tank without any bait. The GAE was always rummaging around and I found both of mine inside the trap the next morning.
Alternatively, you can try
http://www.aquamoss.net/Articles/Catching-SAE.htm
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