What causes black mold in tropical fish tank?

Black mold in tropical fish tanks is often caused by excess organic material, such as uneaten food, decaying plants, or fish waste, which provide nutrients for mold growth. Insufficient water circulation and poor filtration can exacerbate the problem by allowing stagnant areas where mold can thrive. Additionally, high humidity and elevated temperatures typical of tropical environments can create ideal conditions for mold proliferation. Regular tank maintenance, including water changes and cleaning, can help prevent black mold from developing.