I change his water about once every two weeks, but I think I'll start doing it more often for as long as he lives(which might now be that long! )But anyhow, I've recently added a plant to his otherwise "boring" critter keeper thing I keep him in. He seems to enjoy sitting in the plant, lol. I just did a water change about an hour ago, I put some de-chlorinizer in, aswell as some stress coat stuff that I bought at Petland about a month ago. It's supposed to releive the stress, take out the chlorine, and enhance their natural slime coat. Harvey still lays on the bottom though, no matter what I do. I've just been researching though and apparently if the water is too cold it can cause them to be sluggish, so I might add some warmer water to his condo.