Why are there bubbles in your fire belly toads tank?

Bubbles in a fire-belly toad's tank can result from several factors, primarily due to aeration and biological activity. They may form from the agitation of water caused by a filter or aerator, or from the natural respiration of aquatic plants and beneficial bacteria. Additionally, uneaten food and waste can create surface tension, leading to bubble formation. Regular tank maintenance, including cleaning and water changes, can help minimize excessive bubbling.