Can I use this to put a rock background on the inside of aquarium?

Absolutely. I bought it to make an aquarium into a vivarium (1/2 water and 1/2 land). Works great. If you are using lots of small rocks, lay it on its back and spread sealant with something disposable like cardboard or a wood shim. Dont be shy. Use a lot. Press rocks in and let it dry good (48 hrs). When you tip it back up a few might fall off, more sealant and patch it in. I find smaller rocks work better than larger.

To ensure I am ordering the correct one - this is the clear silicone, correct?

yes it is clear, nice size tube, I glued my hole ten gallon aquarium and have enough left to fix several more,I though it was a good buy when I looked at the price at the store and I didn't have to hunt for it.

Will this fix a water fountain?

Hi there! Thanks for your question. This has not been tested on water fountains, so unfortunately, we cannot advise.

What tool did you use to squeeze the tube? It takes alot of pressure to get it to come out and i can only get about a foot done at a time

Hi there! You shouldn't need a tool, but it is possible that the product has expired. We kindly advise you to contact us at 1-888-255-4527 so we can send you a new tube.

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💧 Seal your aquarium leaks like a pro—because your aquatic world deserves the best!

MADE IN THE USA - Premium quality silicone crafted with trusted American manufacturing standards.
AQUARIUM SAFE FORMULA - 100% non-toxic silicone, perfect for all aquatic environments.
LEAK PROOF CONFIDENCE - Creates a permanent, waterproof seal that never cracks or shrinks.
EFFORTLESS APPLICATION - Smooth, easy-to-use liquid form for precise sealing every time.
COLOR CODED VERSATILITY - Clear for standard tanks, black for black aquariums—blend seamlessly.

This 3 oz. 100% silicone aquarium sealant by Aqueon offers a high-strength, waterproof, and non-toxic solution designed specifically for aquarium maintenance. It forms a permanent, crack- and shrink-resistant seal, available in clear or black to match your tank style, ensuring leak-free aquatic environments with easy application and trusted American quality.

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Material	Silicone
Brand	Aqueon
Style	Standard
Item Weight	0.22 Pounds
Item dimensions L x W x H	5.1 x 5.1 x 14.6 Centimeters
Water Resistance Level	Waterproof
Item Form	Liquid
UPC	015905650038
Net Quantity	1 count
Global Trade Identification Number	00015905650038
Number of Items	1
Colour	Clear,Black
Surface Recommendation	Glass
Department	Maintenance
Manufacturer	All Glass Aquarium
Country of Origin	USA
Item model number	100165003
Product Dimensions	5.08 x 5.08 x 14.61 cm; 99.79 g
ASIN	B0002ASD2K

Silicone 3 oz.

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