Dive keeping one cichlid (cutteri) isnt really a large enough sample also maybe you skimped on reseach i have agressive cichlids in with little fish/community type non cichlids in all of my tanks with no issues its about knowing each fish requirements and finding suitible matches.
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Little guys were fine for the first week, even with the ever pestering giant danios. But then they just started attacking the catfish so I had to pick whether to keep the pair of cichlids or a striped raph and gibbiceps pleco, and after making my decision and asking everyone in the house which the liked better we decided unanimously to get rid of the cichlids. They're with a great new owner now though, they've got a 180g all to themselves for breeding.