Okay, after getting a lot of great advice here and other places, I've finally begun construction on my project. Ultimately, the paludarium will house 3 broken-striped newts, some snails, lots of pond organisms, and... that's about it.
Materials:
1. 29 gallon aquarium
2. Cypress driftwood. I soaked then dried it, though it was really dry when I got it. The last soaking ended up with much clearer water.
3. Fluval Plus 1 internal filter for a teeny water feature. I actually don't filter my newts' current tank because they really don't need it - the plants and pond creatures take care of everything.
4. All Glass aquarium safe silicone, black. I got a sweet deal on this, better than the price of the GE brand at Lowe's
5. Great Stuff
6. 1/2" diamater vinyl tubing, for the water feature.
The land area is going to be really small, to leave most of the space for the newts. I covered the boundaries with black silicone:
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Then I stuck the driftwood in place with silicone. Only the large piece needed to be propped up with a little sling. The silicone cured really quickly and held the wood secure:
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I threaded the vinyl tube for the water feature through the back of the driftwood (leaving a lot of extra on each side). I also stuck a smaller tube through it so that the GS wouldn't collapse the tube when it expanded. Then I filled in with GS:
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I had to be super careful to make sure there were no little crevices behind the wood that my newts could squeeze themselves into. I just stuck the little nozzle of the GS can back there and filled up the cracks.
The next steps will be to trim back the GS, and add the black silicone and coco fiber to the top of it. The areas that will be touching the water will be just straight silicone, but they'll be hidden under driftwood anyway.
I'll update when I get it done
