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Re: breeding fish in planted tanks

>Now, recently I started seeing some 
>strange behaviour. On occasion they 
>seem to change colour pattern. It seems 
>to be happening more after a water 
>change or after I add fertiliser to

Hi Dirk,
I've never kept them because I have small tanks, but I have always heard
that C. siamensis get aggressive with each other as they mature.  They
will fade their colors when they are stressed or fighting.  Here's a
really good page about them: