01-18-2008, 10:53 AM
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Ten gallons per fish is not nearly enough. I had a group of 8 and they were in a 5 foot 135g tank. At maturity, I thought they should have be in something larger, although I don't think that they were suffering from a lack of space. I would recommend that you use a formula of 1-2 square feet per fish. Tank height could be from 20"-30".
Pirhana are a schooling, social fish, much like their cousins the tetras. They do best in schools of 6 or more. Live, meaty foods should be provided. I used to buy large quantitiesof goldfish and feed them high nutrient diets before giving them to the pirhana. This increased the "gut load" of the goldfish.
Pirhana are a very "dirty" fish. Frequent, regular water changes must be made. Water changes of 50% or more are the norm. They are also a very skittish fish. Their tank is best placed in a low traffic area. I have even had my fish jump out of the tank while I was cleaning it. These fish are not for the beginner and demand a great deal of dedication by their owner.