I saw them eating while they were being fed at PR, so should be no problems. Just target feed them with a syringe or something if they are shy to emerge.
Oh yes derf, a little sidetrack..if your helfrich is not a mated pair one might actually have become dominant and has been bullying the other one. IMO it would be best to separate them. I once had a 'pair' of firefish that were getting along fine and sleeping together... one fine day one of them slimpy wacked the daylights out of the other. In the end the other one was literally bullied to death. And it had no brains to swim to the other side of the tank to escape the bully.