Not sure of those things your using, but I was talking with this guy who makes rockwall's on all his tanks and he told me an easy way to make it look great, and not weigh a ton.
What he said to do, if I remember correctly, is put black silicone on the back of the tank. A thin layer at about 1/8 of an inch thick. This will help the next step.
Then you take the foam they use as insulator. Im not sure what its called but its the foam that expands a lot. So anyway you put some on the back, let it dry. And then carv out bumps with an exacto-knife.
Then again with the black silicone, you lay the tank down and place chunks of black silicone. He said to do it in sections. You wear like a glove (the clear dentist ones) and mold it how you like. Then when its still wet, place some cocofibre on it if you want. Then when it dries you lift it up, and the excess comes off. Walla, you have a new, very natural, looking tank.
I havnt tried it, but was thinking of doing it for my crested gecko or chameleon sometime soon.
Good luck.
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Adam
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