When I first got my girl she was about 5ft, I kept her in a tub for around half a year with no problems. I can't remember the dimensions of the tub off the top of my head, I do remember I got it from Home Depot though. As long as you set it up right you should have no issues; however, I only have experience with it being a temp setup so if you want it set up for long-term or permanent I would suggest looking around to see if you can talk to someone who actually has done it in the past or is doing it presently.
One thing I will say though: If you get a tub setup, SECURE THE TOP. Like, over-secure it. I used cinderblocks on the lids for a few days and she STILL somehow managed to get out. Had to use bungee ties that we could just barely get around it to keep her in.
We will never forget you...
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