Water tempertures

They'll do well in anything from 72 to 80. I set mine at 75.
 
Some species (eg some Corydoras) will go below the 72 mark quite happily. :nod: Pirahnas are an interesting choice for your first fish. What size tank are they in?
 
72 is too low IMO for most tropical fish, my coldwater tank was warmer than that at 73F. Anything from 75F-80F is considered a good middle ground but some fish like cooler (eg, cories) and some warmer (eg, discus).

HTH
 

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