Is this a sighn of a pair?

[guppy1]

ok i have had my jewel cichlids for about 3-5 months now, I have 4, but last week one was killed by the others, know yesterday my smaller on was killed, so know my 2 biggest ones are all i have got, the longer slimmer dugg a hole right up close to the tipped over flower pot and stays their the majority of the day, the shorter fatter one swims around and eats the majority of the day, does this mean they are going to have fry? :idea:
thanks shane

 

[Needeles]

Here is some info regarding male/female.

To tell the difference between a male and a female Hemichromis guttatus (Jewel Cichlid) once they are about 2 inches in length, the female turns a deep red through out her body when she's looking for a mate, the male gets reddish colored cheeks but the rest of his body is either light pink in color or a yellowish green with a red line around the edge of his fins. You will also notice that the female’s body is slightly rounder than the male and her Jewel spot on her gill plate is slightly smaller than that of the male. The male will be slightly longer with a higher back than the female.

Most cichlids will pair up and continue to mate for life. Usally when breeding the eggs are laid on a cleaned rock and then moved to pits dug behind the rocks.

This may not be a definate sign of breeding as they do like to dig. How big are the 2 left in the tank? How are twords each other? What are there colors?