Zebra Danio Behavour?

Jim1984

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Mar 7, 2010
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Derby, England
I have a new tank with 3 zebra danios which has not started cycling yet, my orginal filter had zeolite in ive removed that and fixed it all up so there in there 2nd day with fixed filter, 8th if you count the zeolite days.

To start of with they were acting like i had read and imagined, occupying the top to middle area of the tank, the odd game of chase etc, but the last couple of days ive moticed one of them hiding away for long periods in a rock cave i have. I thought it was nothing to start but its just in there all the time now.

Im not sure what sex they are. Is this normal???
 

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