how big are the cichlids at the moment and which ones are they?
your twenty gallon tank, please could you give us the dimensions just so that we can tell how much room your little guys are in...
I'm sure that they may be 'fine' or doing well at the moment, but 20Gal is really too small for a cichlid tank in my opinion.
Various web sites give out lots of information about 'fish keeping/husbandry' of these fish and for the life of me i can not remember anywhere stating that 20Gal is big enuff.
Several say that you could if pushed usee a 30Gal tank as long as the footprint is 30" long - but like i said, please could you tell us the dimensions of the tank to put our minds at ease