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Which fish first
April 20, 2015
3:05 am
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Deakin15
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Forum Posts: 5
Member Since:
April 19, 2015
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Hi, I'm new here and recently back to the hobby after many years away from it.  Of course things have changed and I'm amazed at the new technology i've come across so far.  I've also forgotten a lot about which fish to keep and although I've done quite a lot of reading, I would like some help on what order I should buy the fish I've decided to keep.

My tank is a 55 litre cube which is doing a fishless cycle at the moment, on the recommendation of a work colleague I'm using Biomature and Bacterlife, the Biomature has finished and the Nitrite is now reducing with the Bacterlife so I'll soon be ready to start adding fish and was wondering which fish to add first.

I thought I'd just go for small fish with about half a dozen each of Aspidoras, Celestial Pearl Danios and Ember Tetra.  I thought I'd leave the Aspies until last but which of the others would you advise buying first for the newly matured tank?  

April 20, 2015
5:15 pm
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Byron Hosking
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Forum Posts: 152
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November 3, 2008
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My first comment is to note that "cycled" and "matured" (or "established," the term used in the species profiles) are two different things.  A matured or established tank is one in which the biological system has basically stabilized, and this usually occurs somewhere after two months of there being fish in the aquarium.  Various bacteria (the nitrifying are one set but there are several others) will establish on all surfaces covered by water, what we call a biofilm, and especially within the substrate.  This requires the presence of fish as well as plants (if any).

Turning to the mentioned species, I think all of these will be too much for this small a tank, so I would suggest either just the CPD, or alternatively a mix of the Ember and Aspidoras.  Of the latter two, the Aspidoras should go in last.  I have found these to be particularly sensitive.  And I would definitely have more than just six; a group of nine minimum, or a few more, would be better.  The Ember Tetra are best in larger groups too, 10-12 or so.  And the CPD are also recommended in much larger groups--our profile (Celestichthys margaritatus) recommends 20 or more, which would be best on their own for the reasons noted in the profile.

Hope this helps.

Byron.

Byron Hosking, BMus, MA Vancouver, BC Canada
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