* What does the white gunk look like? Is it fuzzy, slimy, powdery, or crusty?
* Where is the white gunk? Is it on the glass, the decorations, the plants, or the substrate?
* What kind of fish tank do you have? Is it freshwater or saltwater?
* How long has the tank been set up? Is it a new tank or an established tank?
Once I have this information, I can give you specific advice on how to remove the white gunk and prevent it from coming back.
In the meantime, here are some general tips:
* Clean the tank regularly: This is the most important step in preventing white gunk build-up.
* Use a siphon to remove debris from the bottom: This will help to remove any excess food or waste that can contribute to gunk formation.
* Scrape algae off the glass: Algae can be a source of white gunk, so removing it regularly is important.
* Use a good quality tank cleaner: Many different tank cleaners are available, but choose one that is specifically designed for freshwater or saltwater tanks, depending on your setup.
Important: Never use any cleaning products that contain ammonia, bleach, or other harsh chemicals in your fish tank. These substances can be toxic to your fish.