Most silicon based adhesives will be OK in a marine environment.
Yes absolutely.
There is no adhesive in toilet paper.
I would use an epoxy.
The short answer is yes, you can use a saltwater aquarium for freshwater. When cleaning the inside and outside of any aquarium only use plain water; do not use soap or any other cleaning agents. If the tank is made of glass, use a razor blade scraper to remove algae and mineral build up. Use care when scraping around the seams. Acrylic aquariums require special scrapers to keep from scratching its surface. These scrapers are available at most pet and aquarium stores. If the aquarium has not been filled with water for several months it is best to test for leaks. To keep your home dry, fill the tank with water outside on a flat, level surface which can support the weight. Leave water in the aquarium for about an hour. If the aquarium holds water it is ready to be set up.
I would not use superglue in an Aquarium. I think there may be something on the superglue containers/tube stating that it is not for use in water.
Adhesive tape is another term for sticky tape, particularly the kind which is intended for use in fastening bandages and other healthcare applications.
sodium chloride
Try silicone.
Fake Coral
For building decorations and aquariums, I use pure clear silicone sealant which is also labeled "For Aquarium Use". Do not use silicone with any kind of algaecide in it (such as Silicone II at the hardware store) as the algaecide is toxic. Let the item dry until you don't smell fumes anymore and then it is safe to put into the tank or to fill with water. I also use aquarium epoxy (cut piece, knead, use), but it only comes in "stone" or "white" and both colors look like chewing gum in the aquarium. It dries rock solid, however, and is what I use when I will be able to completely hide the epoxied area. It works great for sealing pipe leaks and fittings and for building sumps.
If you are using salt to help treat an illness, then you will need aquarium salt or epsom salt; if it's for a saltwater tank, then it's marine salt.In either case, never use table salt as the iodine will kill your fish
Silicone adhesive.