04-09-2013, 03:33 PM
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Guppies becoming suddenly agressive.
Just a quick one. I have 4 male guppies that have been living in harmony for a good month or so in a 24L tank. Day before yesterday they moved to a newly set up planted 65L tank. Transition went smooth for all 4 guppies and 2 Glowlights + 2 Penguin Tetras. Slight Hiccup with Nitrite spike in the middle of the night (50% water change at 4:20am, trying to be quiet boiling kettles and with noisy taps not fun, but hey ho...the things I do for my fish!) All were happy for the first 24 hours.
Came up to do a water test after tea and noticed the largest guppy Barry was pestering the other guppies (none of the tetra's) especially Bubbles. They were all cowering away most of the time, only a few times did it go nose to nose. Then all the guppies turned on Barry at once and gave him hell for leather around the tank. Barry now has his own little bachelor pad in a breeding net to cool off!
I suspect this is finding out who is most dominant, but I do not want to leave it to chance over night. Is it ok to let him out? Any ideas on why all of a sudden he's being a thug. They've all been friendly for aaaages with no hiccups until now!
Thanks in advance! :)