09-13-2010, 07:52 PM
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Originally Posted by spike0544
pH 6.8 and hardness 40, My wife really enjoys the cardinals so I would have to try to talk her out of it. As for the hatchets, how many should I get and would that finish the tank off or is there something else you would suggest.
Assuming the hardness is 40 ppm, that's very soft, equal to 2-3 dGH. Close to what I have. Soft water fish will be perfectly suited to that. And the pH will fall fairly quickly once the tank is established. My tap water pH is 7-7.2 and my tanks run 6.2-6.4 with < 1dGH and < 1dKH. All water is different though, from the tap I mean. But let the tank mature a bit and see where the pH goes. Cardinals later might work well.
Like all characins, hatchets are shoaling fish; as notedin our profile, minimum 6 but more is better. In a 55g, 9-11 would be nice.