Iv got a 90g tank
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You will need to upgrade if you hope to keep any of these fish. A 150 would be an ok growout for the first year then after that, you have to get BIG. 8x3 (360ish gallons) is the minimum foot print for ONE smaller ATF and you'll need something on the order of 1000 gallons for a group or a single GATF. You can get away with a smaller setup if you have tons of current and the tank is dedicated to and specialized for the ATF. I currently have a 7" fish growing out in a 150 who is very happy. I'm also running 4000ish gallons per hour of current in the tank to appease him. Other than current loving characins, there's not much that can cohab with the fish. If I get a dither that behaves in a way that stresses the GATF, I get rid of it as well. These fish are very specialized in their needs and if you don't cater to them, you'll have a very expensive dead fish.