f**k Missing neons + serpae tetras?? help?

Well, I asked a question yesterday about serpaes and their temperament, mine seemed to be doing great with everyone in my tank. (i've had five four about 2 weeks and added 4 more to finish up the school this week)

It is 55 gallons, 9 serpaes, pearl and honey gourami (get along fine), 5 kuhli loaches..

I DID have a school of 6 neon tetras, I'm now down to 4.

I read about the serpaes being aggressive but mine didnt seem to have a problem, until i noticed i only had 4 neons, all with nipped tails. After a half an hour of trying to scoop them out, i succeeded and rehomed them to my 10 gallon (temporary) with my dwarf gouami and glofish.

They're currently hiding in the massive amount of plants I have in my ten gallon, poor little guys.

My question is, is it possible the serpaes ate two of my neons? I've checked every plant, every rock, every aerator for a body, even checked to see if they somehow got into my filter, but I have found absolutely NOTHING.

Did the school of serpaes have a midnight snack last night or what??

I do plan on getting more fish (not neons) for this tank so would i be better off giving them back to my fish store?? I love them but I don't want more missing fish on my hands.