They do make super tall terrariums, and you can also get custom ones, although for HLers you really don't need them. Some of them really don't need that much light at all either. I grow some under lights in my closet and I just use a $40 light set up that I got a home depot. If you want to go all out with a nice 4 bulb T5 system for your plants, it's only really going to run you about $75 if you look in the right place. But I'd really recommend highlanders. They're much easier in my opinion, and are also so much cooler and better looking. I'd start out with a species like sanguinea that is super pretty, but also very easy to grow in household conditions. The main thing with Hlers is that they appreciate about a 20 degree temperature drop at night. For the ones that I grow in my room, I just open the window at night and my room cools from about 70-75 to 55-60 degrees and my plants are all super happy. Hope this helps!