Back in October of 2018, I posted about how water changes can upset hierarchical dynamics of cichlids. That post was about a recent scholarly journal article focusing on angelfish. The premise was that the removal of tank water and the introduction of fresh water during a water change dilutes the chemicals that angelfish expel and depend on for social status reconciliation.
A couple of days ago, while looking for some additional information on chemical cues, I found a very interesting article published in 2015 titled “Chemical communication in cichlids: a mini-review“. This article covers chemical communication in cichlids within multiple contexts (e.g., reproduction, social hierarchies, recognition). I would encourage you to read it when you get an opportunity.