DIY tank decor/backgrounds/hardscapes

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? It’s in my shrimp tank so I don’t want it to affect water parameters (ph, gh, kh), but I’ll need it heavy enough to sink the foam I sculpt it out of. Any suggestions from firsthand experience?
 
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FishNturt808

Fish Fanatic
Joined
Jan 10, 2021
Messages
120
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113
Location
Kihei, Maui
D68207B4-79E4-4775-871E-8741D7EB3854.jpeg

The rock tower in the center is actually the sandfall. It’s made out of landscape rocks and pvc. Held together with superglue and silicone. It’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 I’d like to make something more sturdy.
 

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