Can I put a Piranha in a ten gallon tank? If not, how big does the tank have to be? What is the most similar fish that is very aggressive that uses feeder fish and can fit in a ten gallon tank?
A 20 gallon won't be large enough either. Most pirhanas get a foot or larger thus they need a larger tank to swim and turn around in. They also are extremely messy eaters and need a large quantity of water to dillute the junk in.I put my pirahana in my ten gallon just because it looked cool. but I made sure that I had a 20 gallon for when he gets bigger. so what I'm trying to say is you can as long as you have another tank for when he gets big.