Aquarium silicone sealant is safe to use inside a fish tank? Such as in glueing ornaments and filter pipes?

Is safe. Aquarium sealant is made to be used to stick things inside and outside the tank.

Make a turtle platform

Dap 08641 Dow Corning Clear Silicone Sealant 10.1-Ounce $3.29 Dap 08641 10.1 fl oz; clear 100% silicone [PRICE is per TUBE]…

Loctite 908570 ,2.7-Ounce Tube Clear Silicone Waterproof Sealant $2.75 3 oz. Silicone is the most universal means of sealing common household joints and cracks that are subject to direct water contact. This indoor/outdoor formula withstands temperature extremes and adheres to a wide variety of materials. It is also pH neutral for use in aquariums. Use it to bond and seal sinks, tubs, plumbing fixtures, windows, and siding….

Dap 00688 Household Waterproof Adhesive Sealant, 100% Silicone, 2.8-Ounce Tube $3.25 Dap 00688 2.8 fl oz; clear [PRICE is per TUBE]…

Permatex 80050 Clear RTV Silicone- 3-Ounce $2.23 Permatex. General purpose, RTV indoor outdoor sealant. Seals, bonds, repairs, mends, and secures glass, metal, plastics, fabric, vinyl, weatherstripping, and vinyl tops. Protects and repairs electrical wiring. May be applied to horizontal or vertical surf…

Cycle Tank Sealer Kit – From KBS Coatings – Up to 5 Gal Tank – #1 Rated Gas Tank Sealer $36.95 Gold Standard Fuel Tank Sealer, from the makers of KBS Coatings, is a superior, single-component, ready-to-use fuel tank sealer. Gold Standard Fuel Tank Sealer is specifically formulated to stop rust and corrosion by forming a tough, fuel impervious coating while simultaneously sealing small pinholes and weld seams. This kit contains our KBS AquaKlean (a water-based, heavy-duty, cleaner/degreaser)…

Permatex 80855 #66 Clear Silicone Adhesive Sealant, 11 oz. Cartridge $9.56 May be applied to horizontal or vertical surfaces. Waterproof and flexible….

3M 08019 Clear Marine Grade Silicone Sealant Tube – 3 fl. oz. $7.49 Color – Clear. Remains flexible with excellent resistance to the marine environment. Adheres to bare and painted metal, fiberglass, glass, non-oily woods and many plastics and abraded rubbers. Ideal for head and galley sealing applications. Also excellent gasket adhesive and formed-in-place gasket material….

3M 08029 Clear Marine Grade Silicone Sealant – 1/10 Gallon $22.33 Ideal for head and galley sealing applications. Also excellent gasket adhesive and formed-in-place gasket material….