I am in the process of building a 29 gallon Paludarium from a "Marty Made" 29 gallon tank with sliding glass doors.
I ordered some 1/2" Bulkhead fittings from the LFS and a 1 1/8" Drill bit from glass-holes.com and I drilled out the two holes and installed the bulkheads. I want to keep as much equipment outside the tank as possible since it's a limited space already.
After I drilled the tank I sized up some plastic egg crate and cut it to fit inside, around the bulkheads. I will be gluing the egg crate to the back of the aquarium and then using great stuff on top of that. I have found that the egg crate gives the Great Stuff much more surface area to grab hold of, and it seems to make it hold it's shape better. The last two times I did a great stuff background without it, it wound up shrinking and pulling away from the glass, with the egg crate it seems to stay in place nicely.
The filtration will be done with an Eheim 2213 and the output will be used to create a waterfall in the tank. I will probably have to use the doubletap to restrict the flow a bit so the waterfall isn't too powerful, or I may T it off and divert some of the water directly back to the pool area.
My Goal is to create a smaller version of this tank,
Paludarium Construction Photo Journal - The Planted Tank
Here is the first set of pictures
Next I installed the glass divider. I went with a simple angled piece of glass instead of trying to replicate the underwater cave area in the link I provided (which would have been cool, just couldn't figure an easy way to do it). I siliconed it in place and it sits just below the track of the sliding doors (I now regret not making it a bit shorter, as the cork bark sitting atop the divider now sits higher then the sliding track

). I spackled the silicone on the front where the divider is as well, as I will trim it out to match the foam, and hide the glass from view, as I dont like the view of glass siliconed to the front of the tank.
Next I started on the background. as mentioned I use Plastic Egg crate as a lattice to keep the foam in place. If you stick the nozzle of the Great Stuf right into a corner of a cell, it will inject Great Stuff under it, and then expand into and over the cell, so it completely encases the egg crate and holds on very well. It seems to cure/set faster as well, and it doesn't shrink or pull from the glass when you do it this way.
I let the foam cure for 2 days and then I did the fun task of Silicone and Coco Fiber. Worked on areas about 8-10 square inches at a time and made sure I got the silicone in every nook and cranny. Let it sit about an hour before I blew off the excess fiber with compressed air and moved onto the next section. Basically took the whole day to finish this. The stupid compact fluorescent in my floor lamp is throwing a nice yellow hue which is making my photos look crappy. It looks pretty good in person.
And that's basically where I am at now.
I am trying to decide if I should do an egg crate false bottom, or just a layer of Hydroton. The animal which will call this Paludarium home for the time being is a south american water snake (small liophis species, gets 2-3 foot max and is only a hatchling right now) so I need to make sure the snake cant get down to the Hydroton or get below the Egg crate. I am thinking maybe I will just keep my bromeliads and other terrestrials in pots for the time being and just do a layer of deep substrate, no drainage area, and I will have to clean it out every now and then.
If anyone has ideas on the best way to do the land area, I am all ears

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Any other comments/feedback are welcome as well. Thanks for looking!