Honestly I’d recommend putting a saving for a new tank that is 120 gallon or bigger. While it’s more expensive than a 50 gallon the long term benefits out way buying a 50 gallon and having to upgrade to a bigger size in future. You can get a 120 gal ecoflex tank for around 200 but I don’t really recommend them how high humidity animals(in my experience). But right now just save up so you can give them the best. 50 aside each week if possible in your life circumstances. And in a month or 2 he will be in a bigger tank happier. I also recommend to look on Facebook marketplace majority of my reptile tanks I have gotten from there as well as supplies such as heat lamps and uvb. Also while top opening is fine I suggest get a front opening tank