Zoopoxy
Colin C from Dendroboard created a couple awesome tanks using zoopoxy.
This first tank was created with insulation foam siliconed together and carved to look like rocks. He then covered the rocks with epoxy & watered down acrylic paint. Turned out pretty cool!
Another tank that he built uses epoxy to create a rocky background. This turned out pretty well as well. 
Dendroboard user Azurel created numerous rocks & backgrounds using the epoxy and they turned out really well!
Lastly, here are some details from Josh Moore’s builds. They look so real you wouldn’t even know that it isn’t real wood.
Sorry for so many pictures, but Zoopoxy is amazing and you can create some really cool stuff with it.
Thanks to everyone who stopped by during April’s A to Z Challenge! Monday will be a recap of the challenge and then I will resume normal posts after that!
The Frog Lady 
Looks amazing! Congrats on getting to the end of the challenge
Thanks! I am glad I made it through! Off to see yours!
That’s amazing stuff!! I’m guessing artists must use, too.
Congratulations on finishing!
You can find me here:
ClarabelleRant
yeah! It can be used for many different things!
Congrats on finishing as well! The month flew by pretty fast!
I learned a lot from your posts. Congratulations on finishing the challenge!!
thanks! I am glad! It was fun to do and can’t wait until next year to do it again!
Where I live if you want decorative rock you pay for it by the pound. Thinking maybe I should try this instead. Thanks for the idea.
I have found a couple places that sell both rocks and wood by the pound. Rocks add up really fast! If you are artistic you could definitely make it work with zoopoxy instead!