Orange Sakura missing in evolve8

Hi guys, I've run in to a dilemma. As the title states, I'm missing 10 Orange Sakura that I recently put in to one of those little Aqueon Evolve8 AIOs. I saw one hanging out in the back of the filter area by the pump, and when I tried to catch him he disappeared as well. After doing a little snooping, I found a hidden area underneath the filter area that I wasn't aware was open. I've checked under the driftwood, around the plants, and I can't find any of the rest. They are the only inhabitants of the tank, so a muncher isn't a problem here. In case you're wondering how they got into the back, a portion of the foam I had blocking the intake slipped down, and a few of the vents were open. I'm guessing they slipped through that. I have since addressed that issue, but I am trying to figure out how to get the ones that (I hope) are hidden back there. I was thinking a fish net with something they would snack on sitting in the back part of the tank might draw them out, but I'm not sure what I would need to entice them. Any other ideas would be greatly appreciated. Sorry for the ramble, and thanks in advance for any tips.