funny, i was going to post the same question.
but i would say that as they are a bright colour which usually indicates poison i wouldn't risk it untill i had all the facts
I agree with ladybugs being poisonous, but it depends on the species (there are at least 10!) I would try to take them out of your tank if at all possible-no sense in taking chances especially with cichlids (voracious beasts).
You could probably even make a temp lid out of cardboard or something. But that would be for a short time because Im sure it would get soggy. If you wanted something more permanant wood or plexiglass should work. Does anyone know how long the ladybug season is???