Yes. But not in that way. The main fish I am trying to grow are tropical. They grow better at 28c. They are in the IBC. Now. The fat goldfish are indoors until winter here. I may need to send them off to Jenny Craig first. I am using my indoor system as a raising tank. Plus it gives good nitrate levels each week to my outdoor system. During water changes. the fish I am growing will get to over 1.8mtrs or six feet long. But not this season. I expect them to be 600mm or two feet long by Autumn, which is the month of May over here. I am growing Barramundi.