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i have three SAE in my 50 gallon tank and sometimes, 2 of them just chase each other around then stop and swim in circles. During that time, they lose color on their body. I don't know what that is, does anybody ever have that?
I've seen that with my SAE (Crossocheilus siamensis) and with my Yo-Yo Loaches (Botia almorhae). I keep hoping that it is ritualistic courting behavior but I've never seen anything come of it. Both of these types of fish can get aggressive with others of their kind at times so it could just as easily be territorial displays.