chicilid behavior

Question
have a small tank only 20 gallions with three chiclids.  one is bout four inches and the other two half that.  Lately the two smaller ones seem to be hiding in a corner one over the other.  They stay there all day except for feeding time. the larger one seems to nip them when they come out.  i have no idea what their sex or types are.  they have been living peacably for years

Answer
Hi Chet,
 As fish get older their behavior can change.  It is very possible that the larger fish is now an adult and is feeling territorial and that is why he chases the other fish.  You may have to separate them.  

-- Ron
  rcoleman@cichlidresearch.com
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