Southern Justice, further to all the above advise; I would like to add that altho Piranhas are very hardy fish; I would recomend you to start with little older ones. 1" natterery babies seems too small to me.
Use no plastic or rubber hoses, use external filters, no electric wires, if internal heater it should be protected... as said by DROSERA
Fishfirst is right about your fingers... they will be safe as far as piranhas feel no danger (and are small).
Avoid violent moves during maintainance.
You will find little problem with dirty water every time after you feed them with live fish. They show no good manners while eating... they may bite each other during lunch time... but this is the best reason to have piranhas in your tanks, isnt it?
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