Maybe the fish and bacteria in your tank did away with the bodies. I once found a "lost" fish in a 10 gallon I had long ago, it was just an outline, but I recognized it as an albino catfish.
Is there any chance they could have jumped?
I'd remove the remainder of the barbs, cause if the other two were killed by a cichlid, there's a chance you won't have any left. Are there still any danios? I once had a an oscar that ate my danios.
*Also, this page would suggest that barbs and cichlids are not compatible:
Freshwater & Brackish Compatibility Chart
Convicts originate in central america, while the barbs originate in southern asia. Since these fish aren't mixed in nature, I think it's advisable not to mix them in a tank.
-68 to 73 degrees F is needed by convicts and fish of that like, while your tiget barbs need 74 to 79 degrees F. I believe their ph levels also differ.
-Because these fish evolved in such differant places, light, food and water movement is most likely also an issue. Having them share the same tank would be like you having to share an apartment with someone from Indonesia, it may be okay for a while, but you know you can't live with the person forever. You have differant wants and needs, in an enviornment where you thrive, could kill your room mate.
Hope that wasn't too boring for you, and good luck on keeping all your fish.
i would think that it would cause a rise in the two
