how to make humidty in a tank?

I do not know how to make an aquarium humid. I do not have any potting soil.. so what else? How can I do this?
Answers:
a small waterfall will help, ore you can put in a bole of water and get one of those "bubblers" (you now the things you hook up to air hoses and put in fish tanks to give them air) and put it in the dish, it will make mist that will increase the humidity.

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You can add a bowl of warm water inside the tank, maybe cover half the lid to keep the moisture in. If you can get spagnum or moss - that should help. Be careful though, a moist tank can get fungus and can grow germs fast.

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A buddy of mine used sponges. He would get them nice and moist and place them under the bottom of something (whatever items you have in the tank. His was a branch he had). You obviously have to keep it moist over time, and it helps to have a heat source nearby (not directly on it, but close to help evaporate it). I'm not saying this was his best solution, but it did seem to help.

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I have hermit crabs and they require 70-80% humidity. I use Eco earth as a substraite, you keep it damp and that helps. Covering 70% of the lid(if it's mesh) with saran wrap works too. Heat lamps are bad for drying things up, so a under the tank heating pad works the best. You can also mist the tank daily with a spray bottle. You can also buy foggers at most petstores, I do hear they don't work too well tho. Good luck

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we usually have to make sure humidity levels are high when our snakes start to shed. they do sell misters which from time to time go off sand spray a mist in the tank that keeps it humid.. we usually just keep a water bottle with hot water and mist it throughout the day. think of a hot shower the hot water misting hot boxes the bathroom makes it humid .. same with a tnak.

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- Use a solid lid like an aquarium hood with a light, rather than a screened lid.

- Use reptile moss, available at any petstore. DO NOT USE anything from a garden nursery! This stuff is not treated the same as the stuff made for animals. Soak it in warm water, squeeze out the excess, and lay it across some or all of the bottom of the tank.

- Use a humidity blanket. You can find these at petstores as well, you fill them with water and it slowly evaporates over a week or so, releasing constant moisture.

- If you need a high-humidity tank such as for a frog, there are automatic misting systems available- the ones at petsmart and petco are adjustable and fairly cheap- 30-40 bucks at most. You can set them to spray water into the tank every 10 minutes to 2 hours or something like that.

- If you're home a lot, buy a regular spray bottle, set it to a very fine mist, and hand spray the tank 2-3 times a day.

- If you already have a screen lid and cannot buy a tank, place a wet towel over 3/4 of the lid leaving just a small gap for air circulation.