05-01-2013, 03:07 PM
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Others have talked about nitrates and plants, so I'll just get to the fish part of your question.
Trying to further clarify some things for myself first though, sorry.
When you add the tap water the saltwater fish die? You don't have any freshwater fish at the moment do you?
If that's the case I would just use your tap water to set up the tank. The fish you mentioned will love it, aside from the rainbow and that needs a bigger tank than you have regardless. Stick with softwater, acid loving fish and you will only need to harden your water a little for the plants. No need to worry about changing KH or PH.
Last edited by BWG; 05-01-2013 at 03:17 PM..