"I just moved my Cal king into a 75 gallon tank, and I need ideas! The tank is a glass aquarium with a screen top. I know that a lot of people who use screen tops have problems with humidity, and so I plan to use some live plants (in addition to a large water dish). I have a...black thumb, so I have to use plants that are pretty hardy. I was thinking of using a common type of ivy (i.e. English ivy), but does anyone have any ideas as to what other plants I could use? For the sake of simplicity, I'll be leaving whatever plant I use in a pot. Is potting soil (enriched with MiracleGro) toxic? If so, what should I use instead?
Here's a picture of the setup as it is. I'm using aspen as a substrate. I'll add more furniture soon, but I wanted to ask around and get some opinions as to what I could do to enrich the environment"
Okay, for starters, I wouldn't recommend using English Ivy. Even though snakes aren't herbivores, it is a poisonous plant and I wouldn't suggest it for a terrarium. You could use Algerian Ivy or Pothos very easily, with the same effect. Pothos is an extremely hardy plant... I haven't managed to kill off my mother's pothos houseplants in the two years I've neglected them. ^_^
Miracle gro potting soil is mainly not suggested for amphibians, but I don't think it fares well in a glass terrarium either. I bought some of the Miracle Gro Organic Soil from Walmart (pretty cheap too) which consists of peat moss, sphagnum moss, leaf mulch, and natural fertilizers. I mixed it in as a substrate in my tank with coconut husks, more peat moss and sphagnum mixture, and orchid bark, but you could use it in your pots. Pothos will grow very well in just a container of water, so if your water dish is big enough, you could just root a clipping or two of it right in the water. I also have two types of Dracaena in the back of my tank. He likes climbing those. I've arranged some "frog moss" around the tank (pretty sure it's just regular sphagnum) to keep moisture in certain spots, like over the heater where my pothos might dry out. I've got a drainage layer of rocks in the bottom, but that's because my entire tank is my "flowerpot." 
What type of hides do you have for him? You could also secure moss to the tops of the hides if they're wood. Moss definitely helps keep the humidity up.
I've really studied up on creating natural terrariums. ^_^ I think I have as much fun doing that as I have watching and spending time with my herps. 
Pictures of everything, including a couple of his burrowing holes. He loves having this much substrate. ^_^











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Holly

0.1 Lavender California Kingsnake (Lizzie Borden) (missing
)
1.0 Florida Kingsnake possible mix (Eddie Gein)
1.0 Bearded Dragon (Charley Manson)
1.0 Orange Marmalade Cat (Oliver)
1.0 Egyptian Arabian (Bagan)
2.0 Toddlers (Justice & Trevor)