Hello,
I currently have a 13-14" silver arowana (Gandalf) in a 75 gallon. He's growing fast, and soon I'm planning on building a pond for him (and other predatory fish). The basic measurements would be 12' wide x 12' long x 4' deep. I think thats around 3000-4000 gallons. May be to big for him currently, but I'm planning for the future. My only problem is: what do I do about water changes? Obviously, that much water volume doesn't leave much room for water changes. In the 75 gallon, I have to do a 30% water change at LEAST every 2 weeks, or his swimming patterns become irregular and he stops eating. Would the much larger volume of water and a good filter eliminate the need for a water change?
I currently have a 13-14" silver arowana (Gandalf) in a 75 gallon. He's growing fast, and soon I'm planning on building a pond for him (and other predatory fish). The basic measurements would be 12' wide x 12' long x 4' deep. I think thats around 3000-4000 gallons. May be to big for him currently, but I'm planning for the future. My only problem is: what do I do about water changes? Obviously, that much water volume doesn't leave much room for water changes. In the 75 gallon, I have to do a 30% water change at LEAST every 2 weeks, or his swimming patterns become irregular and he stops eating. Would the much larger volume of water and a good filter eliminate the need for a water change?
