Yeah, the big tanks are incredibly heavy. I have trouble lifting a 25 gal. tank on my own (maybe because i'm a weakling lol). I guess the people that use them have other people help them lift the tanks, I don't know.
As for plastic tanks, I don't think I've seen any anywhere, but as was mentioned above a lot of people make PVC or ABS plastic reptile enclosures that are really nice visually and are super light and easy to clean.
P.S. a gallon of water is 4 litres, and if you use bleach to clean anything out you REALLY have to let it air out, especially if you decide to go for one of the reptile display cages.
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