Ok noted that, I put in a few gel's to begin with (on his web) just in-case, I'll clear them out next time. The spider doesn't go on the floor at all, its a tree dwelling spider I believe, so I was concerned it wouldn't see the water on the ground. It did have a go at all the gel blobs quite keenly, I'll put a cola cap's worth of water at the bottom.
^ I've set up the habitat like a burrowing adult tarantula's, but since this is tree dwelling, I might turn the tank on it's side (and seal up some of the holes) for a taller habitat when it's ready. In the meantime, having the substrate in even though the spider isn't using it, has helped the humidity a lot. Initially I was looking at 40-50%, now after a spray I'm easily at the 80% that's required.
Here he is in the tub with some redundant water gels pending removal. Also, the reason the tub is upside down is because the spider always climbs up and nests at the top. If I have the lid at the top I have to continually disturb it, so It's at the bottom, however, this means I can't have any substrate inside the actual tub. I might add some leaves or sticks to climb on.
I also noticed the crickets are growing which is nice, saves me some food costs =p