You can buy a screen top at a pet store but you will lose a lot of humidity and that's already gonna be an issue with a 55gal tank as it is so tall. I personally would recommend a plexiglass lid. Most aquariums have a small lip on the top designed to hold a glass top. If you cut plexiglass to fit there you could drill several small holes around the perimeter for ventilation without losing all your heat and humidity. You could secure it with cam locks. Do a search on th DIY forum for a guy who designed a 10gal tank top in this same manner. If you can't find it let me know and I'll try to.
I suppose I'll say before someone else does...an aquarium isn't ideal for a snake.
1. The snake can see to much activity and can get stressed.
2. You lose a lot of heat and humidity because of the unnecessary height.
Now that being said as long as you are able to keep temps and humidity up and provide at least two hides (a hot and a cool) I see no reason why you can't make it work just fine. I have kept several in aquariums with no issues and I'm sure you can too. I hope this helps and if you have any questions let me know. Good luck and have fun!
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