What is the best thing to clean your fish tank with?
You should simply clean the aquarium with hot water. If you wish, you can mix some non-iodized salt in the water you are using to clean the tank. You may want to use a clean razor blade to scrape off any algae or calcium clusters which you can’t remove from the glass with water alone.
Is it OK to clean a fish tank with dish soap?
Do not use any soap when cleaning a fish tank, as even traces of soap can be deadly for fish. If the algae won’t come off by scrubbing, bring a pot of water to a boil, turn off the heat, and then place the items in the hot water for 20 minutes.