An aquarium sealant is a type of adhesive specifically designed for use in aquariums to create a watertight seal. It is typically made of silicone and is safe for use in underwater environments. Aquarium sealant is used to bond and seal aquarium glass panels, as well as to attach decorations and other accessories to the aquarium walls. It is important to use a sealant that is specifically formulated for aquarium use to ensure the safety and well-being of the aquatic life inside the tank. **

To remove sealant from an aquarium, you can use a razor blade or a putty knife to carefully scrape away the old sealant. Be sure to work slowly and gently to avoid damaging the glass. Once the majority of the sealant is removed, you can use a solvent like acetone or rubbing alcohol to dissolve any remaining residue. Make sure to thoroughly clean the area with water and allow it to dry completely before resealing the aquarium. Always use caution and follow safety guidelines when working with sharp tools and solvents. **

Some of the most resistant algae in aquariums are green algae, such as hair algae and filamentous algae. These algae are able to thrive in a variety of water conditions and can quickly take over an aquarium if not properly managed. They are often resistant to common algae treatments and can be difficult to eradicate once established. It is important for aquarium hobbyists to regularly monitor and maintain their tanks to prevent these resistant algae from taking over. **

The red coating in the aquarium is likely a type of algae known as red slime algae or cyanobacteria. This type of algae can form a slimy, red or reddish-brown coating on surfaces in the aquarium, such as rocks, substrate, and decorations. It is often a sign of poor water quality, low oxygen levels, or high nutrient levels in the aquarium. To address the issue, it is important to improve water quality through regular maintenance, such as water changes, and to ensure proper filtration and circulation in the aquarium. **

The white coating in your aquarium is most likely a buildup of calcium deposits, also known as calcium carbonate. This can occur due to hard water or high pH levels in the tank. It can also be caused by excess food or waste accumulating on surfaces and hardening over time. Regular cleaning and maintenance of your aquarium, along with monitoring water parameters, can help prevent the buildup of this white coating. **

To apply a new waterproofing membrane on top of an old bitumen waterproofing membrane, the surface of the old membrane should be thoroughly cleaned and prepared. Any loose debris, dirt, or old adhesive should be removed to ensure proper adhesion of the new membrane. Once the surface is clean, a primer should be applied to promote adhesion between the old and new membranes. Finally, the new waterproofing membrane can be installed according to the manufacturer's instructions, ensuring that it is properly sealed and bonded to the old membrane to provide effective waterproofing. **

The white coating on the aquarium bottom is likely calcium deposits or mineral buildup. This can occur due to hard water or the use of certain substrates that release minerals into the water. It is important to regularly clean and maintain the aquarium to prevent excessive buildup, as it can affect water quality and the health of the fish. Using a gravel vacuum during water changes can help remove some of the white coating. **

The greenish coating on the aquarium floor is most likely algae. Algae can form in aquariums due to excess nutrients, light exposure, and poor water circulation. It is important to regularly clean the aquarium and maintain proper water parameters to prevent the overgrowth of algae. Additionally, introducing algae-eating fish or invertebrates can help control the algae population in the aquarium. **