How do you keep it clean?

[privet01]

could you explain how you siphon it out with a hose?

It's easy to do, hard to explain.

I use an old piece of rubber hose that was intended to be fuel line for an automobile. It's about a 1/4 inch inside diameter. But just about any hose or flexible tubing will work. It needs to be long enough to reach the bottom of the tank with the other end going into the bucket which must be lower than the bottom of the tank. Preferably on the floor if your viv tank is on a table or stand.

Put an inch or so of water in the bottom of your bucket. Fill the hose with water from a faucet. You can hold both ends level and put one under the water faucet, when water comes out the other then put your thumbs over both end and stick them down in the water. Don't let them come out of the water or you'll get air in the hose which can stop it from achieving a siphon.

When you are at the viv, pick up the hose with both ends covered with your thumbs. Removing your thumb from just the end that you are putting in the tank, plunge it into the bottom of water in your viv. Then put the other end down into the bucket and remove your other thumb from the end of the hose and water will flow. If the end in the tank gets exposed to air, you'll likely have to fill it again start over.

I'm finding a huge amount of conflicting info!

Yeah, Partially because what works for some doesn't work for others. So you have to think about it and see if the advice is something that might work for you then try it. And partially, because most of us really have no idea what what we are talking about <<grin>>

People saying that a dish of water in fine because the frogs like land better, people saying they need at least 50% water because they like water better

IMO, FBT's need 50 to as much as 80 percent water. At least if we are talking B. orientalis. Mine spend most of their time in the water. If I let my water goes too long between changes, I notice they will be on land more. Perhaps the others claiming they don't like water have unhealthy ammonia levels or such.

people saying that you need a filter and pump, people saying that the frogs don't like filters and pumps

I only have a gallon of water in my ten gallon viv, I don't use a filter, but I usually change it weekly. I check the ammonia and nitrate/nitrite levels periodically and never have they been excessive in less than 10 days.

If I had more than a gallon or had a water feature such as a stream or water fall, then I'd consider using a filter and pump as I'd not want to spend that much time dealing with lengthier water changes every week. But then again, I probably have to check ammonia levels more often.