I've been researching temperature tolerance of different fish for a tropical pond in south Texas. Cichla were one of the fish I was considering. I found some threads on here asking the same question so I thought I'd post this link for future reference for anyone else thinking of cichla in out door ponds.
http://nis.gsmfc.org/nis_factsheet.php?toc_id=171
http://nis.gsmfc.org/nis_factsheet.php?toc_id=171
