Who done it? mysterious fishy mass disappearance

[Diogenes]

I removed some juvies from my tank last night, traded them at the LFS for 8 black phantom tetras which were all i thought bigger than my cichlid's mouths, and when I awoke this morning there were only two left.

here's my stock:
1 6" Archocentrus centrarchus (Male)
1 4" " " (female)

1 4" Ameca splendens (female)
1 slightly smaller Ameca splendens (male)

1 4" BN Pleco

2 black phantom tetras

Who ate the other six tetras? What should I try as schooling fish? the green flier cichlids killed the platy's that were there before, and now I see tetras arent gonna work. Any ideas?

 

[robmcd]

I had a school of 40 black jumbo black neons that I put in with my 3'' beanis, carpintis, and t. maculipinnis and now there are only 8 left this morning. They are picking them off when the lights are out. They killed the 15 red eye tetras first and at 2'' they were nearly as big as the cichlids.... Seems to me that they catch them by the tail then proceed to rip them apart ...