Piranha or Arowana?

I don't want to sound rude but 60G is nothing for those fishes you're listed even if you getting 1~2 inches Piranha they will out growth that 60G in few months same for 6 inches Jardini. If you want they are active and healthy, happy then you should try to get a bigger tank! As for other information PH should be around 6.5~7.5, temp 75F~86F

The only piranha that belong in a 60 gallon are wimples. As for arowana not a single species should be put in one unless your using it to quarantine or growout to a MUCH bigger tank. Sorry for being blunt but it's the truth.

james99 said:

One thing I've learned is to get the tank first, then the fish. It took forever for me to get my 125 setup. Sometimes stuff doesnt work out as planned.

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+2 This^

+3 I planned on getting a bigger house that way I could fit a bigger tank. that hasn't worked out yet so I have been selling the fish as they continue to grow and are getting to large for my current tank.

+4 impulse buying is why there are so many monster fish traded in the hobby.