DIY tank decor/backgrounds/hardscapes

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FishNturt808

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So the superglue on my sandfall (underwater waterfall) has starting failing, rocks coming dislodged. Has anyone sculpted foam and coated it to put in their aquarium? Itā€™s in my shrimp tank so I donā€™t want it to affect water parameters (ph, gh, kh), but Iā€™ll need it heavy enough to sink the foam I sculpt it out of. Any suggestions from firsthand experience?
 
D68207B4-79E4-4775-871E-8741D7EB3854.jpeg

The rock tower in the center is actually the sandfall. Itā€™s made out of landscape rocks and pvc. Held together with superglue and silicone. Itā€™s held well the last 3-4 months, just now the rocks are starting to fall off. In in trying to reattach more fall off. So Iā€™d like to make something more sturdy.
 

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